CVE-2024-39652
📋 TL;DR
This vulnerability allows attackers to inject malicious scripts into web pages generated by the WooCommerce PDF Vouchers WordPress plugin. When users visit a specially crafted URL, the script executes in their browser, potentially stealing session cookies or performing actions on their behalf. All WordPress sites using vulnerable versions of this plugin are affected.
💻 Affected Systems
- WPWeb Elite WooCommerce PDF Vouchers
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers steal administrator session cookies, gain full control of the WordPress site, install backdoors, deface the site, or steal customer data including payment information.
Likely Case
Attackers steal user session cookies, redirect users to malicious sites, or perform actions on behalf of authenticated users.
If Mitigated
Script execution is blocked by browser security features or Content Security Policy, limiting damage to session hijacking attempts.
🎯 Exploit Status
Reflected XSS typically requires user interaction (clicking a malicious link), but exploitation is straightforward once a malicious URL is crafted.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.9.5
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'WooCommerce PDF Vouchers' and click 'Update Now'. 4. Verify version is 4.9.5 or higher.
🔧 Temporary Workarounds
Implement Content Security Policy
allAdd CSP headers to block inline script execution and restrict script sources.
Add to .htaccess: Header set Content-Security-Policy "default-src 'self'; script-src 'self'"
Add to nginx config: add_header Content-Security-Policy "default-src 'self'; script-src 'self';";
Input Validation Filter
allAdd WordPress filter to sanitize all input parameters before processing.
Add to theme functions.php: add_filter('sanitize_text_field', 'custom_sanitize_input'); function custom_sanitize_input($input) { return htmlspecialchars($input, ENT_QUOTES, 'UTF-8'); }
🧯 If You Can't Patch
- Disable the WooCommerce PDF Vouchers plugin immediately.
- Implement a Web Application Firewall (WAF) with XSS protection rules.
🔍 How to Verify
Check if Vulnerable:
Check plugin version in WordPress admin under Plugins > Installed Plugins. If version is below 4.9.5, you are vulnerable.Check Version:
wp plugin list --name='woocommerce-pdf-vouchers' --field=versionVerify Fix Applied:
Confirm plugin version is 4.9.5 or higher in WordPress admin. Test vulnerable endpoints with XSS payloads to ensure they are properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual GET/POST requests containing script tags or JavaScript code in URL parameters
- Multiple failed XSS attempts in web server logs
Network Indicators:
- HTTP requests with suspicious parameters like <script>, javascript:, or encoded payloads
SIEM Query:
source="web_server_logs" AND (url="*<script>*" OR url="*javascript:*" OR url="*%3Cscript%3E*")