CVE-2025-31439
📋 TL;DR
A Cross-Site Request Forgery (CSRF) vulnerability in the tobias_.MerZ Browser Caching with .htaccess WordPress plugin allows attackers to trick authenticated administrators into performing unintended actions. This affects WordPress sites using the plugin version 1.2.1 through all subsequent versions until patched. Attackers could modify caching settings or potentially perform other administrative actions.
💻 Affected Systems
- tobias_.MerZ Browser Caching with .htaccess 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 could disable caching entirely, modify security headers, or potentially chain with other vulnerabilities to gain further access to the WordPress site.
Likely Case
Attackers could disrupt site performance by modifying caching settings, causing slower page loads and degraded user experience.
If Mitigated
With proper CSRF protections and user awareness, impact is minimal as it requires user interaction and authentication.
🎯 Exploit Status
CSRF attacks are well-understood and relatively easy to implement, but require social engineering to trick authenticated users.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check WordPress plugin repository for latest version
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Browser Caching with .htaccess' plugin. 4. Click 'Update Now' if available. 5. Alternatively, delete and reinstall latest version from WordPress repository.
🔧 Temporary Workarounds
Temporary Plugin Deactivation
allDisable the vulnerable plugin until patched version is available
wp plugin deactivate browser-caching-with-htaccess
Add CSRF Protection Headers
linuxImplement additional CSRF protections at web server level
# Add to .htaccess: Header set X-Frame-Options "DENY"
# Add to .htaccess: Header set Content-Security-Policy "frame-ancestors 'none'"
🧯 If You Can't Patch
- Implement strict SameSite cookie policies for WordPress authentication cookies
- Educate administrators about CSRF risks and safe browsing practices
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Browser Caching with .htaccess → View version. If version is 1.2.1 or higher without confirmed patch, assume vulnerable.Check Version:
wp plugin get browser-caching-with-htaccess --field=versionVerify Fix Applied:
Verify plugin version is updated to latest from WordPress repository and check that CSRF tokens are present in plugin admin forms.📡 Detection & Monitoring
Log Indicators:
- Unusual .htaccess modifications from WordPress admin IPs
- Multiple failed caching configuration changes
Network Indicators:
- POST requests to wp-admin/admin.php?page=browser-caching-with-htaccess without proper referrer headers
SIEM Query:
source="wordpress.log" AND "admin.php?page=browser-caching-with-htaccess" AND NOT referrer="*wp-admin*"