CVE-2025-11814
📋 TL;DR
This stored XSS vulnerability in the Ultimate Addons for WPBakery WordPress plugin allows unauthenticated attackers to inject malicious scripts into website pages. When users visit compromised pages, the scripts execute in their browsers, potentially stealing credentials or performing unauthorized actions. All WordPress sites using vulnerable plugin versions are affected.
💻 Affected Systems
- Ultimate Addons for WPBakery Page Builder (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 inject malicious scripts to steal user session cookies, credentials, or perform actions on behalf of authenticated users.
If Mitigated
With proper web application firewalls and content security policies, script execution could be blocked, limiting damage to attempted attacks.
🎯 Exploit Status
Attackers can exploit this without authentication by submitting specially crafted input that gets stored and executed when users view affected pages.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.21.1 and later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Ultimate Addons for WPBakery Page Builder'. 4. Click 'Update Now' if update is available. 5. Alternatively, download version 3.21.1+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Temporary Plugin Deactivation
WordPressDisable the vulnerable plugin until patched
wp plugin deactivate ultimate_vc_addons
Web Application Firewall Rules
allConfigure WAF to block XSS payloads targeting the plugin
🧯 If You Can't Patch
- Disable the Ultimate Addons for WPBakery plugin completely
- Implement strict Content Security Policy headers to block inline script execution
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins → Ultimate Addons for WPBakery version numberCheck Version:
wp plugin get ultimate_vc_addons --field=versionVerify Fix Applied:
Confirm plugin version is 3.21.1 or higher in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to WordPress admin-ajax.php or plugin endpoints containing script tags
- Multiple failed XSS attempts in web server logs
Network Indicators:
- Inbound requests with JavaScript payloads in parameters
- Outbound connections to suspicious domains from your website
SIEM Query:
source="web_server_logs" AND ("ultimate_vc_addons" OR "ultimate-addons") AND ("<script>" OR "javascript:" OR "onerror=" OR "onload=")