CVE-2025-13401
📋 TL;DR
The Autoptimize WordPress plugin has a stored XSS vulnerability that allows authenticated attackers with contributor-level access or higher to inject malicious scripts into web pages. These scripts execute when users visit the compromised pages, potentially stealing credentials or performing unauthorized actions. All WordPress sites using Autoptimize versions up to 3.1.13 are affected.
💻 Affected Systems
- Autoptimize 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 administrator credentials, deface websites, redirect users to malicious sites, or install backdoors for persistent access.
Likely Case
Attackers with contributor access inject malicious scripts to steal user session cookies or perform actions on behalf of authenticated users.
If Mitigated
With proper input validation and output escaping, the vulnerability is eliminated and no exploitation occurs.
🎯 Exploit Status
Exploitation requires authenticated access at contributor level or higher. The vulnerability is in the create_img_preload_tag function where user-supplied image attributes aren't properly sanitized.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.1.14
Vendor Advisory: https://plugins.trac.wordpress.org/changeset/3401333/autoptimize
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find Autoptimize and click 'Update Now'. 4. Verify version is 3.1.14 or higher.
🔧 Temporary Workarounds
Disable LCP Image Preload Feature
allTemporarily disable the vulnerable LCP image preload functionality in Autoptimize settings
Remove Contributor Access
allTemporarily restrict contributor-level access until patching is complete
🧯 If You Can't Patch
- Restrict user roles to only trusted administrators
- Implement web application firewall with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for Autoptimize version 3.1.13 or lowerCheck Version:
wp plugin list --name=autoptimize --field=versionVerify Fix Applied:
Verify Autoptimize version is 3.1.14 or higher in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to wp-admin/admin-ajax.php with image attribute parameters
- Multiple failed login attempts followed by successful contributor-level login
Network Indicators:
- Suspicious JavaScript payloads in HTTP POST parameters
- Unusual outbound connections after page visits
SIEM Query:
source="wordpress.log" AND ("autoptimize" OR "create_img_preload_tag") AND ("script" OR "javascript" OR "onerror" OR "onload")