CVE-2025-68878
📋 TL;DR
This vulnerability allows attackers to inject malicious scripts into web pages generated by the Advanced Custom CSS WordPress plugin. When users visit a specially crafted URL, the script executes in their browser, potentially stealing session cookies or performing actions on their behalf. All WordPress sites using vulnerable versions of this plugin are affected.
💻 Affected Systems
- Advanced Custom CSS 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 session cookies, take over WordPress sites, deface websites, or redirect visitors to malicious sites.
Likely Case
Attackers steal user session cookies or credentials, perform actions as authenticated users, or redirect users to phishing pages.
If Mitigated
With proper input validation and output encoding, malicious scripts are neutralized before reaching users' browsers.
🎯 Exploit Status
Reflected XSS vulnerabilities are commonly exploited and require minimal technical skill.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.1.1 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find Advanced Custom CSS. 4. Click 'Update Now' if available. 5. If no update appears, manually download version 1.1.1+ from WordPress.org and replace plugin files.
🔧 Temporary Workarounds
Disable Plugin
allTemporarily disable the vulnerable plugin until patched.
wp plugin deactivate advanced-custom-css
Web Application Firewall
allDeploy WAF rules to block XSS payloads targeting this plugin.
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution
- Use web application firewall to filter malicious input targeting plugin endpoints
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin > Plugins > Installed Plugins for Advanced Custom CSS version. If version is 1.1.0 or earlier, you are vulnerable.Check Version:
wp plugin get advanced-custom-css --field=versionVerify Fix Applied:
After updating, verify plugin version shows 1.1.1 or later in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual GET/POST requests to plugin endpoints with script tags or JavaScript payloads
- Multiple failed attempts to access plugin admin pages
Network Indicators:
- HTTP requests containing <script> tags or JavaScript in query parameters targeting plugin URLs
SIEM Query:
source="wordpress" AND (url="*advanced-custom-css*" AND (query="*<script>*" OR query="*javascript:*" OR query="*onload=*"))