CVE-2025-5923
📋 TL;DR
The Game Review Block WordPress plugin has a stored XSS vulnerability in all versions up to 4.8.1. Authenticated attackers with Contributor access or higher can inject malicious scripts via the 'className' parameter, which execute when users view affected pages. This affects all WordPress sites using vulnerable versions of this plugin.
💻 Affected Systems
- Game Review Block 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 steal admin credentials, deface websites, redirect users to malicious sites, or install backdoors for persistent access.
Likely Case
Attackers with contributor accounts inject malicious scripts to steal session cookies or redirect users to phishing pages.
If Mitigated
With proper input validation and output escaping, no script execution occurs, though malicious content may still be stored.
🎯 Exploit Status
Exploitation requires authenticated access but is technically simple once access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.8.2 or later
Vendor Advisory: https://wordpress.org/plugins/game-review-block/#developers
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Game Review Block' and check if update is available. 4. Click 'Update Now' or manually update to version 4.8.2+. 5. Verify plugin is active and functioning.
🔧 Temporary Workarounds
Disable vulnerable plugin
allTemporarily disable the Game Review Block plugin until patched
wp plugin deactivate game-review-block
Restrict user roles
allRemove Contributor role access or implement stricter role-based access controls
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block XSS payloads in className parameter
- Regularly audit user accounts and remove unnecessary Contributor-level access
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → Installed Plugins for Game Review Block version. If version is 4.8.1 or lower, you are vulnerable.Check Version:
wp plugin get game-review-block --field=versionVerify Fix Applied:
After updating, verify plugin version shows 4.8.2 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to WordPress admin-ajax.php with className parameter containing script tags
- Multiple failed login attempts followed by successful Contributor-level login
Network Indicators:
- Outbound connections to suspicious domains after visiting pages with game reviews
- Unusual JavaScript loading patterns
SIEM Query:
source="wordpress.log" AND ("className" AND ("<script" OR "javascript:" OR "onerror=" OR "onload="))🔗 References
- https://github.com/mtoensing/game-review-block/commit/135aa118b75db5242df7fd1ef13cc09ec3410f3a
- https://plugins.trac.wordpress.org/browser/game-review-block/tags/4.7.0/src/game-table/callback.php#L38
- https://wordpress.org/plugins/game-review-block/#developers
- https://www.wordfence.com/threat-intel/vulnerabilities/id/88520d8e-8e13-4b58-9df3-3b99afd39144?source=cve
