CVE-2025-66824
📋 TL;DR
A stored XSS vulnerability in TrueConf Server v5.5.2.10813 allows attackers to inject malicious scripts via the meeting location field. When users view conference information, the script executes, potentially enabling full account takeover. This affects all TrueConf Server deployments running the vulnerable version.
💻 Affected Systems
- TrueConf Server
📦 What is this software?
Server by Trueconf
⚠️ Risk & Real-World Impact
Worst Case
Attackers achieve full account takeover, steal session cookies, redirect users to malicious sites, and potentially gain administrative access to the TrueConf Server.
Likely Case
Attackers steal user session cookies, perform actions as authenticated users, and potentially escalate privileges within the system.
If Mitigated
With proper input validation and output encoding, the script payloads would be neutralized, preventing execution and limiting impact to data corruption.
🎯 Exploit Status
Exploitation requires creating or editing a conference with malicious payload in the meeting_room parameter. Attackers need some level of access to the conference functionality.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://trueconf.com
Restart Required: No
Instructions:
1. Monitor TrueConf vendor website for security updates. 2. Apply the official patch when available. 3. Verify the fix by testing the meeting_room field with XSS payloads.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement server-side validation to sanitize meeting_room field input, removing or encoding HTML/JavaScript characters.
Content Security Policy
allImplement strict Content Security Policy headers to prevent execution of inline scripts and unauthorized sources.
🧯 If You Can't Patch
- Disable or restrict access to the Create/Edit Conference functionality for non-administrative users.
- Implement web application firewall (WAF) rules to block XSS payloads in the meeting_room parameter.
🔍 How to Verify
Check if Vulnerable:
Test by creating a conference with a simple XSS payload in the meeting_room field (e.g., <script>alert('XSS')</script>) and check if it executes on the Conference Info page.Check Version:
Check TrueConf Server version in the web interface or configuration files.Verify Fix Applied:
After applying fixes, repeat the XSS test payload to ensure it's properly sanitized and doesn't execute.📡 Detection & Monitoring
Log Indicators:
- Unusual meeting_room field entries containing script tags or JavaScript code
- Multiple conference creation/modification events from single user
Network Indicators:
- HTTP requests with suspicious payloads in meeting_room parameter
- Outbound connections to external domains from conference pages
SIEM Query:
search 'meeting_room' AND ('script' OR 'javascript:' OR 'onload=' OR 'onerror=')