CVE-2025-62951
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in the H5P WordPress plugin allows attackers to inject malicious scripts into web pages that persist across sessions. When users view pages containing the malicious content, the scripts execute in their browsers, potentially stealing credentials or performing unauthorized actions. All WordPress sites using H5P plugin versions up to and including 1.16.0 are affected.
💻 Affected Systems
- WordPress Interactive Content - H5P 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, take over WordPress sites, deface websites, or redirect users to malicious sites, potentially leading to complete site compromise and data theft.
Likely Case
Attackers inject malicious scripts that steal user session cookies or credentials, allowing account takeover of regular users or administrators who view the compromised content.
If Mitigated
With proper input validation and output encoding, malicious scripts would be neutralized before reaching users, preventing execution while maintaining plugin functionality.
🎯 Exploit Status
Exploitation requires ability to create or edit H5P content, which typically requires at least contributor-level access in WordPress.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 1.16.1 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'Interactive Content - H5P' plugin. 4. Click 'Update Now' if update available. 5. Alternatively, download version 1.16.1+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Input Sanitization
allImplement custom input validation and output encoding for H5P content fields
🧯 If You Can't Patch
- Restrict user roles that can create/edit H5P content to trusted administrators only
- Implement web application firewall (WAF) rules to block XSS payloads in H5P content submissions
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for H5P plugin version 1.16.0 or earlierCheck Version:
wp plugin list --name=h5p --field=versionVerify Fix Applied:
Verify plugin version is 1.16.1 or later in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- Unusual H5P content creation/modification patterns
- Multiple failed XSS attempts in web server logs
- Suspicious JavaScript payloads in POST requests to H5P endpoints
Network Indicators:
- Malicious script tags in HTTP POST data to /wp-admin/admin-ajax.php or H5P-specific endpoints
- Unexpected external resource loads from H5P content pages
SIEM Query:
source="web_server" AND (uri_path="*h5p*" OR uri_path="*wp-admin/admin-ajax.php*") AND (http_method="POST") AND (message="*<script>*" OR message="*javascript:*")