CVE-2025-8059
📋 TL;DR
The B Blocks WordPress plugin has a critical privilege escalation vulnerability that allows unauthenticated attackers to create new administrator accounts. This affects all WordPress sites using B Blocks versions 2.0.6 and earlier. Attackers can gain full administrative control over vulnerable WordPress installations.
💻 Affected Systems
- B Blocks WordPress Plugin
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete site takeover with attacker gaining administrator privileges, installing backdoors, defacing content, stealing data, and using the compromised site for further attacks.
Likely Case
Attackers create hidden administrator accounts to maintain persistent access, then deploy malware, redirect traffic, or use the site for phishing campaigns.
If Mitigated
With proper network segmentation and monitoring, impact is limited to the affected WordPress instance, but administrative control is still lost.
🎯 Exploit Status
Exploit requires sending crafted HTTP requests to the vulnerable registration endpoint. No authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.0.7 or later
Vendor Advisory: https://wordpress.org/plugins/b-blocks/#developers
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find B Blocks plugin. 4. Click 'Update Now' if update available. 5. If no update available, deactivate and delete plugin immediately.
🔧 Temporary Workarounds
Disable B Blocks Plugin
allTemporarily disable the vulnerable plugin until patched
wp plugin deactivate b-blocks
Block Registration Endpoint
linuxBlock access to the vulnerable registration function via web server configuration
# Apache: <LocationMatch "rgfr_registration"> Deny from all </LocationMatch>
# Nginx: location ~* rgfr_registration { deny all; }
🧯 If You Can't Patch
- Remove B Blocks plugin completely from the WordPress installation
- Implement strict network access controls to limit who can reach the WordPress admin interface
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins for B Blocks version. If version is 2.0.6 or earlier, you are vulnerable.Check Version:
wp plugin get b-blocks --field=versionVerify Fix Applied:
After updating, verify B Blocks version is 2.0.7 or later in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /wp-admin/admin-ajax.php with action=rgfr_registration
- New administrator user creation from unexpected IP addresses
- Multiple failed login attempts followed by successful login from new admin account
Network Indicators:
- HTTP POST requests containing 'rgfr_registration' in the request body
- Traffic to WordPress admin endpoints from previously unseen sources
SIEM Query:
source="wordpress.log" AND "rgfr_registration" AND ("role"="administrator" OR "admin")🔗 References
- https://plugins.trac.wordpress.org/browser/b-blocks/trunk/includes/blocks/RegisterForm.php#L77
- https://plugins.trac.wordpress.org/changeset/3340770/
- https://wordpress.org/plugins/b-blocks/#developers
- https://www.wordfence.com/threat-intel/vulnerabilities/id/0ee3b389-60c9-4f8e-9428-a71a6d9b20aa?source=cve
