CVE-2024-9518
📋 TL;DR
The UserPlus WordPress plugin up to version 2.0 contains a privilege escalation vulnerability that allows unauthenticated attackers to assign themselves any user role during registration. This affects all WordPress sites running vulnerable versions of the UserPlus plugin, potentially compromising site security and administrative access.
💻 Affected Systems
- UserPlus WordPress Plugin
📦 What is this software?
Userplus by Wpuserplus
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain administrative privileges, enabling complete site takeover, data theft, malware injection, and further network compromise.
Likely Case
Attackers create administrator accounts to deface websites, steal sensitive data, or install backdoors for persistent access.
If Mitigated
Attackers can only create low-privilege accounts, limiting damage to basic user functionality.
🎯 Exploit Status
Simple HTTP request manipulation required; no authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.1 or later
Vendor Advisory: https://plugins.trac.wordpress.org/browser/userplus/trunk/functions/user-functions.php?rev=1604604#L47
Restart Required: No
Instructions:
1. Update UserPlus plugin to version 2.1 or later via WordPress admin panel. 2. Verify update completes successfully. 3. Test user registration functionality.
🔧 Temporary Workarounds
Disable User Registration
allTemporarily disable user registration in WordPress settings to prevent exploitation.
Deactivate Plugin
allDeactivate UserPlus plugin until patched version is available.
🧯 If You Can't Patch
- Implement web application firewall rules to block requests containing 'role' parameter in registration endpoints
- Monitor user registration logs for suspicious role assignment attempts
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > UserPlus version. If version is 2.0 or lower, system is vulnerable.Check Version:
wp plugin list --name=userplus --field=versionVerify Fix Applied:
Confirm UserPlus plugin version is 2.1 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to registration endpoints with 'role' parameter
- User creation events with non-default roles
Network Indicators:
- POST requests to /wp-admin/admin-ajax.php with action=userplus_update_user_profile containing role parameter
SIEM Query:
source="web_logs" AND (uri_path="/wp-admin/admin-ajax.php" OR uri_path CONTAINS "userplus") AND http_method="POST" AND (params CONTAINS "role=" OR params CONTAINS "form_actions=")