CVE-2025-9890
📋 TL;DR
The Theme Editor WordPress plugin has a Cross-Site Request Forgery vulnerability that allows unauthenticated attackers to execute arbitrary code remotely. Attackers can trick administrators into clicking malicious links, leading to complete site compromise. All WordPress sites using Theme Editor plugin versions up to 3.0 are affected.
💻 Affected Systems
- WordPress Theme Editor 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
Complete site takeover with attacker gaining full administrative access, installing backdoors, defacing the site, or stealing sensitive data.
Likely Case
Attackers inject malicious code into theme files, creating persistent backdoors or redirecting visitors to malicious sites.
If Mitigated
Attack fails due to proper nonce validation or administrator not performing the required action.
🎯 Exploit Status
Exploitation requires social engineering to trick administrators but technical complexity is low.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after 3.0
Vendor Advisory: https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3379404%40theme-editor&new=3379404%40theme-editor&sfp_email=&sfph_mail=
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find Theme Editor plugin. 4. Click 'Update Now' if available. 5. If no update available, deactivate and delete the plugin immediately.
🔧 Temporary Workarounds
Disable Theme Editor Plugin
allTemporarily disable the vulnerable plugin until patched version is available.
wp plugin deactivate theme-editor
Remove Plugin Files
linuxCompletely remove the plugin files from the server.
rm -rf /path/to/wp-content/plugins/theme-editor/
🧯 If You Can't Patch
- Implement strict access controls and limit administrator accounts to trusted personnel only.
- Use web application firewall rules to block requests to theme_editor_theme endpoint.
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for Theme Editor version 3.0 or earlier.Check Version:
wp plugin get theme-editor --field=versionVerify Fix Applied:
Verify Theme Editor plugin is either updated to version after 3.0 or completely removed from the system.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /wp-admin/admin.php?page=theme_editor_theme
- Multiple failed authentication attempts followed by theme file modifications
Network Indicators:
- HTTP requests containing theme file modification parameters without proper nonce validation
SIEM Query:
source="web_access_logs" AND uri="/wp-admin/admin.php" AND query="page=theme_editor_theme" AND NOT nonce=*🔗 References
- https://plugins.trac.wordpress.org/browser/theme-editor/trunk/app/controller/theme_controller.php#L87
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3379404%40theme-editor&new=3379404%40theme-editor&sfp_email=&sfph_mail=
- https://www.wordfence.com/threat-intel/vulnerabilities/id/77189684-b794-41a0-8fc0-3320032c2f69?source=cve
