CVE-2022-0441
📋 TL;DR
The MasterStudy LMS WordPress plugin before version 2.7.6 contains an authentication bypass vulnerability that allows unauthenticated attackers to register new accounts with administrator privileges. This affects all WordPress sites running vulnerable versions of the plugin. Attackers can gain full administrative control without any authentication.
💻 Affected Systems
- MasterStudy LMS WordPress Plugin
📦 What is this software?
Masterstudy Lms by Stylemixthemes
⚠️ Risk & Real-World Impact
Worst Case
Complete site takeover: attackers create admin accounts, install backdoors, steal data, deface site, or use as pivot point for network attacks.
Likely Case
Site compromise leading to data theft, malware injection, or ransomware deployment.
If Mitigated
Limited impact if plugin disabled or patched quickly; existing admin accounts remain protected.
🎯 Exploit Status
Simple HTTP POST request to registration endpoint with modified parameters; widely exploited in the wild.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.7.6
Vendor Advisory: https://plugins.trac.wordpress.org/changeset/2667195
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find MasterStudy LMS plugin. 4. Click 'Update Now' if update available. 5. If no update, manually download version 2.7.6+ from WordPress.org and replace plugin files.
🔧 Temporary Workarounds
Disable Plugin
allTemporarily deactivate the vulnerable plugin until patched.
wp plugin deactivate masterstudy-lms-learning-management-system
Restrict Registration Endpoint
linuxBlock access to user registration endpoints via web application firewall or .htaccess.
RewriteEngine On
RewriteRule ^wp-content/plugins/masterstudy-lms-learning-management-system/.*register.*$ - [F,L]
🧯 If You Can't Patch
- Disable user registration entirely in WordPress settings
- Implement IP-based restrictions on wp-admin and registration endpoints
🔍 How to Verify
Check if Vulnerable:
Check plugin version in WordPress admin panel under Plugins > Installed Plugins. If version is below 2.7.6, system is vulnerable.Check Version:
wp plugin get masterstudy-lms-learning-management-system --field=versionVerify Fix Applied:
Confirm plugin version is 2.7.6 or higher. Test registration functionality with non-admin parameters to ensure validation works.📡 Detection & Monitoring
Log Indicators:
- Multiple user registration attempts from single IP
- New admin user creation from unauthenticated IPs
- POST requests to /wp-content/plugins/masterstudy-lms-learning-management-system/*register*
Network Indicators:
- HTTP POST to registration endpoints with admin role parameters
- Unusual traffic patterns to user registration URLs
SIEM Query:
source="wordpress.log" AND "register" AND "masterstudy" AND ("admin" OR "administrator")