CVE-2025-2537
📋 TL;DR
Multiple WordPress plugins are vulnerable to stored cross-site scripting (XSS) through their bundled ThickBox JavaScript library. Authenticated attackers with contributor-level access or higher can inject malicious scripts that execute when users view compromised pages. This affects WordPress sites using vulnerable plugin versions.
💻 Affected Systems
- WordPress plugins using ThickBox JavaScript library version 3.1
⚠️ 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 administrator credentials, deface websites, redirect users to malicious sites, or install backdoors for persistent access.
Likely Case
Attackers inject malicious scripts to steal user session cookies, perform actions on behalf of users, or display unwanted content.
If Mitigated
With proper input validation and output escaping, the vulnerability would be prevented, limiting impact to potential plugin functionality issues.
🎯 Exploit Status
Exploitation requires contributor-level WordPress access. Public proof-of-concept exists in vulnerability reports.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Plugin-specific updates
Vendor Advisory: https://www.wordfence.com/threat-intel/vulnerabilities/id/59ea7390-3587-4fce-b267-bf525dbe3e27
Restart Required: No
Instructions:
1. Update all affected WordPress plugins to latest versions. 2. Verify ThickBox library is updated to version beyond 3.1. 3. Clear WordPress cache after updates.
🔧 Temporary Workarounds
Disable vulnerable plugins
allTemporarily disable affected plugins until patches are applied
wp plugin deactivate [plugin-name]
Implement Content Security Policy
allAdd CSP headers to restrict script execution sources
Add to .htaccess: Header set Content-Security-Policy "script-src 'self'"
Add to wp-config.php: header("Content-Security-Policy: script-src 'self'");
🧯 If You Can't Patch
- Restrict contributor-level access to trusted users only
- Implement web application firewall with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Check plugin files for ThickBox library version 3.1 references in JavaScript filesCheck Version:
wp plugin list --field=name,versionVerify Fix Applied:
Verify ThickBox library version is updated beyond 3.1 in plugin files📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to plugin endpoints
- Suspicious JavaScript in page content
Network Indicators:
- Unexpected script tags in HTTP responses
- External script loading from untrusted sources
SIEM Query:
source="wordpress" AND ("thickbox" OR "auto-thickbox" OR "nextgen-gallery") AND ("POST" OR "script")🔗 References
- https://plugins.trac.wordpress.org/browser/auto-thickbox/trunk/js/auto-thickbox.js
- https://plugins.trac.wordpress.org/browser/nextgen-gallery/trunk/static/Lightbox/thickbox/thickbox.js
- https://plugins.trac.wordpress.org/browser/youtube-video-player/trunk/front_end/scripts/youtube_embed_front_end.js
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3281159%40nextgen-gallery&old=3276142%40nextgen-gallery&sfp_email=&sfph_mail=
- https://www.wordfence.com/threat-intel/vulnerabilities/id/59ea7390-3587-4fce-b267-bf525dbe3e27?source=cve
