CVE-2025-57900
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in the GutenKit WordPress plugin allows attackers to inject malicious scripts into web pages that are then executed when other users view those pages. It affects all WordPress sites using GutenKit versions up to 2.4.2. Attackers can steal session cookies, redirect users, or perform actions on their behalf.
💻 Affected Systems
- GutenKit Blocks Addon for WordPress
⚠️ 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, take over the WordPress site, install backdoors, deface the site, or use it as a platform for further attacks against visitors.
Likely Case
Attackers inject malicious JavaScript to steal user session cookies, redirect users to phishing sites, or perform actions on behalf of authenticated users.
If Mitigated
With proper input validation and output encoding, malicious scripts would be rendered harmless as plain text rather than executable code.
🎯 Exploit Status
Exploitation requires the ability to inject malicious input into the vulnerable component, which typically requires some level of access or user interaction.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after 2.4.2
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find GutenKit Blocks Addon. 4. Click 'Update Now' if available. 5. Alternatively, download latest version from WordPress repository and manually update.
🔧 Temporary Workarounds
Disable GutenKit Plugin
allTemporarily disable the vulnerable plugin until patched
wp plugin deactivate gutenkit-blocks-addon
Implement Content Security Policy
allAdd CSP headers to restrict script execution sources
Add to .htaccess: Header set Content-Security-Policy "default-src 'self'; script-src 'self'"
Add to wp-config.php: header("Content-Security-Policy: default-src 'self'; script-src 'self'");
🧯 If You Can't Patch
- Disable the GutenKit plugin entirely
- Implement web application firewall (WAF) rules to block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins for GutenKit version 2.4.2 or earlierCheck Version:
wp plugin get gutenkit-blocks-addon --field=versionVerify Fix Applied:
Verify GutenKit version is higher than 2.4.2 in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests containing script tags or JavaScript code to GutenKit endpoints
- Multiple failed XSS attempts in web server logs
Network Indicators:
- HTTP requests containing <script>, javascript:, or encoded XSS payloads in parameters
SIEM Query:
source="web_logs" AND ("<script>" OR "javascript:" OR "onerror=" OR "onload=") AND uri_path="/wp-admin/*"