CVE-2026-2499
📋 TL;DR
The Custom Logo WordPress plugin has a stored cross-site scripting vulnerability that allows authenticated administrators to inject malicious scripts into admin settings. These scripts execute when users view affected pages. Only WordPress multisite installations or sites with unfiltered_html disabled are vulnerable.
💻 Affected Systems
- WordPress Custom Logo 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
Administrator account compromise leading to site takeover, data theft, or malware distribution to visitors.
Likely Case
Privilege escalation, session hijacking, or defacement of admin pages by malicious administrators.
If Mitigated
Limited impact due to requiring administrator access and specific WordPress configurations.
🎯 Exploit Status
Requires administrator-level WordPress access and specific configuration conditions
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.3 or later
Vendor Advisory: https://plugins.trac.wordpress.org/browser/custom-logo/
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find Custom Logo plugin. 4. Click 'Update Now' if available. 5. If no update available, deactivate and delete plugin, then install latest version from WordPress repository.
🔧 Temporary Workarounds
Enable unfiltered_html capability
allEnable the unfiltered_html capability for administrators on single-site installations
Add to wp-config.php: define('DISALLOW_UNFILTERED_HTML', false);
Remove plugin
linuxDeactivate and delete the vulnerable plugin
wp plugin deactivate custom-logo
wp plugin delete custom-logo
🧯 If You Can't Patch
- Restrict administrator accounts to trusted personnel only
- Implement web application firewall with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin > Plugins > Installed Plugins for Custom Logo version 2.2 or earlierCheck Version:
wp plugin list --name=custom-logo --field=versionVerify Fix Applied:
Verify Custom Logo plugin version is 2.3 or higher in WordPress admin📡 Detection & Monitoring
Log Indicators:
- Unusual admin settings modifications
- Suspicious JavaScript in plugin settings
Network Indicators:
- Unexpected script tags in admin page responses
SIEM Query:
source="wordpress" AND "custom-logo" AND ("admin" OR "settings") AND ("script" OR "javascript")