CVE-2025-23767
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in the Marmoset Viewer WordPress plugin allows attackers to inject malicious scripts into web pages. When users view affected pages, the scripts execute in their browsers, potentially stealing session cookies, redirecting users, or performing actions on their behalf. All WordPress sites using Marmoset Viewer versions up to 1.9.3 are affected.
💻 Affected Systems
- Marmoset Viewer 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, install backdoors, or redirect users to malicious sites.
Likely Case
Attackers inject malicious JavaScript to steal user session cookies, redirect visitors to phishing sites, or display unwanted content.
If Mitigated
With proper input validation and output encoding, malicious scripts would be neutralized before reaching users' browsers.
🎯 Exploit Status
Stored XSS vulnerabilities are commonly exploited once discovered. Attackers need to find an input vector that isn't properly sanitized.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.9.4 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find Marmoset Viewer and click 'Update Now'. 4. Verify the plugin version is 1.9.4 or higher.
🔧 Temporary Workarounds
Disable Marmoset Viewer Plugin
allTemporarily disable the vulnerable plugin until patched
wp plugin deactivate marmoset-viewer
Implement WAF Rules
allAdd web application firewall rules to block XSS payloads
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution
- Enable WordPress security plugins with XSS protection features
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → Installed Plugins → Marmoset Viewer versionCheck Version:
wp plugin get marmoset-viewer --field=versionVerify Fix Applied:
Verify Marmoset Viewer version is 1.9.4 or higher in WordPress plugins list📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests containing script tags to Marmoset Viewer endpoints
- Multiple failed XSS attempts in web server logs
Network Indicators:
- HTTP requests containing <script> tags or JavaScript payloads to Marmoset Viewer URLs
SIEM Query:
source="web_server_logs" AND (uri="*marmoset*" AND (body="*<script>*" OR body="*javascript:*"))