CVE-2025-4179
📋 TL;DR
The Flynax Bridge WordPress plugin has a privilege escalation vulnerability that allows unauthenticated attackers to register new user accounts with author-level privileges. This affects all WordPress sites using Flynax Bridge plugin versions 2.2.0 and earlier. Attackers can create administrative-level accounts without authentication.
💻 Affected Systems
- Flynax Bridge WordPress Plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers create administrator accounts, take full control of the WordPress site, install backdoors, steal data, and use the site for further attacks.
Likely Case
Attackers create author/editor accounts to publish malicious content, deface the site, or use it for SEO spam campaigns.
If Mitigated
With proper monitoring, unauthorized user registrations are detected and blocked before significant damage occurs.
🎯 Exploit Status
Simple HTTP POST request to vulnerable endpoint. Public exploit code available in security advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.2.1 or later
Vendor Advisory: https://plugins.trac.wordpress.org/browser/flynax-bridge/trunk/src/API.php
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find Flynax Bridge plugin. 4. Click 'Update Now' if update available. 5. If no update available, deactivate and remove plugin immediately.
🔧 Temporary Workarounds
Disable User Registration
allDisable WordPress user registration to prevent exploitation
Navigate to Settings → General in WordPress admin and uncheck 'Anyone can register'
Web Application Firewall Rule
allBlock requests to vulnerable API endpoint
Add WAF rule to block POST requests to /wp-json/flynax/v1/register
🧯 If You Can't Patch
- Immediately deactivate and remove the Flynax Bridge plugin
- Implement strict monitoring for new user registrations and review all existing author/administrator accounts
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins for Flynax Bridge version 2.2.0 or earlierCheck Version:
wp plugin list --name=flynax-bridge --field=versionVerify Fix Applied:
Verify plugin version is 2.2.1 or later, or plugin is completely removed📡 Detection & Monitoring
Log Indicators:
- Unusual user registrations with author/administrator roles
- POST requests to /wp-json/flynax/v1/register endpoint
Network Indicators:
- HTTP POST requests to vulnerable endpoint from unexpected IP addresses
SIEM Query:
source="wordpress.log" AND ("flynax/v1/register" OR "user registered" AND (role="author" OR role="administrator"))