CVE-2024-11816
📋 TL;DR
This vulnerability allows authenticated WordPress users with Subscriber-level access or higher to execute arbitrary code on the server. It affects sites using the Ultimate WordPress Toolkit – WP Extended plugin version 3.0.11 when at least one code snippet has been created by an administrator.
💻 Affected Systems
- Ultimate WordPress Toolkit – WP Extended plugin for WordPress
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full server compromise allowing attackers to install malware, steal data, deface websites, or pivot to other systems.
Likely Case
Website defacement, data theft, or installation of backdoors for persistent access.
If Mitigated
Limited impact if proper access controls and monitoring are in place to detect unauthorized code execution attempts.
🎯 Exploit Status
Requires authenticated access (Subscriber or higher) and knowledge of the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.0.12 or later
Vendor Advisory: https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3213331%40wpextended&new=3213331%40wpextended&sfp_email=&sfph_mail=
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'Ultimate WordPress Toolkit – WP Extended'. 4. Click 'Update Now' if available. 5. Alternatively, download version 3.0.12+ from WordPress repository and replace plugin files.
🔧 Temporary Workarounds
Disable plugin
allTemporarily deactivate the vulnerable plugin until patched.
wp plugin deactivate wpextended
Restrict user roles
allLimit Subscriber and other low-privilege user accounts until patched.
🧯 If You Can't Patch
- Implement strict access controls and monitor for suspicious user activity.
- Use web application firewall (WAF) rules to block requests to vulnerable endpoints.
🔍 How to Verify
Check if Vulnerable:
Check plugin version in WordPress admin under Plugins > Installed Plugins. If version is 3.0.11 and code snippets exist, system is vulnerable.Check Version:
wp plugin get wpextended --field=versionVerify Fix Applied:
Confirm plugin version is 3.0.12 or later after update.📡 Detection & Monitoring
Log Indicators:
- POST requests to /wp-admin/admin-ajax.php with action 'wpext_handle_snippet_update' from low-privilege users
- Unusual PHP execution or file writes in plugin directories
Network Indicators:
- HTTP requests containing code snippets or shell commands in parameters
SIEM Query:
source="web_logs" AND uri="/wp-admin/admin-ajax.php" AND params.action="wpext_handle_snippet_update" AND user_role IN ("subscriber","contributor","author")🔗 References
- https://plugins.trac.wordpress.org/browser/wpextended/trunk/includes/modules/core_extensions/wpext_snippets/wpext_snippets.php#L705
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3213331%40wpextended&new=3213331%40wpextended&sfp_email=&sfph_mail=
- https://www.wordfence.com/threat-intel/vulnerabilities/id/b3ce53e5-8666-4227-83d3-58f35db0ce68?source=cve
