CVE-2023-51542
📋 TL;DR
This vulnerability allows attackers to bypass IP-based access restrictions in the WPMU DEV Branda WordPress plugin by spoofing their IP address. It affects all WordPress sites using Branda plugin versions up to 3.4.14, potentially allowing unauthorized access to restricted functionality.
💻 Affected Systems
- WPMU DEV Branda 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
Attackers gain administrative access to WordPress sites, modify content, install malware, or steal sensitive data by bypassing all IP-based security controls.
Likely Case
Unauthorized users access restricted areas or functionality meant only for specific IP addresses, potentially viewing sensitive information or performing limited administrative actions.
If Mitigated
With proper network segmentation and additional authentication layers, impact is limited to the specific Branda functionality rather than full site compromise.
🎯 Exploit Status
Exploitation requires sending spoofed HTTP headers to bypass IP checks. No authentication needed if IP restrictions are the only protection.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.4.15 or later
Vendor Advisory: https://patchstack.com/database/vulnerability/branda-white-labeling/wordpress-branda-plugin-3-4-14-ip-restriction-bypass-vulnerability
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Branda' and click 'Update Now'. 4. Verify version is 3.4.15 or higher.
🔧 Temporary Workarounds
Disable IP Restrictions
allTemporarily disable Branda's IP restriction features until patched
Web Application Firewall Rule
allAdd WAF rule to block suspicious X-Forwarded-For and similar headers
🧯 If You Can't Patch
- Implement additional authentication layers (2FA, strong passwords) for restricted areas
- Use network-level IP filtering at firewall instead of application-level
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins → Branda version. If version is 3.4.14 or lower, you are vulnerable.Check Version:
wp plugin list --name=branda --field=versionVerify Fix Applied:
After update, confirm Branda version shows 3.4.15 or higher in WordPress plugins list.📡 Detection & Monitoring
Log Indicators:
- Multiple failed IP restriction attempts from same user
- Access from unexpected IP addresses to restricted endpoints
Network Indicators:
- HTTP requests with X-Forwarded-For headers to Branda endpoints
- Traffic bypassing expected IP ranges
SIEM Query:
source="wordpress" AND (uri_path="/wp-admin/admin-ajax.php" OR uri_path CONTAINS "branda") AND (http_header="X-Forwarded-For" OR http_header="Client-IP")