CVE-2024-50581
📋 TL;DR
This vulnerability allows attackers to inject malicious scripts into YouTrack comments due to improper HTML sanitization. When exploited, it enables cross-site scripting (XSS) attacks that could steal user sessions or perform unauthorized actions. All YouTrack instances running vulnerable versions are affected.
💻 Affected Systems
- JetBrains YouTrack
📦 What is this software?
Youtrack by Jetbrains
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator credentials, take over YouTrack instances, and access sensitive project data or pivot to internal networks.
Likely Case
Attackers could steal user session cookies, perform actions as authenticated users, or deface comment sections with malicious content.
If Mitigated
With proper input validation and output encoding, impact is limited to minor UI disruption or script execution in isolated contexts.
🎯 Exploit Status
Exploitation requires ability to create or modify comments, typically requiring some level of authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2024.3.47707
Vendor Advisory: https://www.jetbrains.com/privacy-security/issues-fixed/
Restart Required: Yes
Instructions:
1. Backup your YouTrack instance. 2. Download YouTrack 2024.3.47707 or later from JetBrains. 3. Stop the YouTrack service. 4. Install the updated version. 5. Restart the YouTrack service. 6. Verify the version is updated.
🔧 Temporary Workarounds
Disable HTML in comments
allConfigure YouTrack to disable HTML rendering in comments to prevent script execution
Configure via YouTrack admin interface: Settings > Workflows > Disable HTML formatting in comments
Restrict comment permissions
allLimit who can create or edit comments to trusted users only
Configure via YouTrack admin interface: Settings > Permissions > Comment permissions
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block XSS payloads in comment submissions
- Enable Content Security Policy (CSP) headers to restrict script execution sources
🔍 How to Verify
Check if Vulnerable:
Check YouTrack version in admin interface or via API endpoint /api/admin/versionCheck Version:
curl -s http://youtrack-instance/api/admin/version | grep versionVerify Fix Applied:
Verify version is 2024.3.47707 or later and test comment functionality with XSS payloads📡 Detection & Monitoring
Log Indicators:
- Unusual comment creation patterns
- HTML/script tags in comment content logs
- Multiple failed comment submissions with script-like content
Network Indicators:
- HTTP requests with script tags in comment parameters
- Unusual outbound connections from YouTrack server after comment submissions
SIEM Query:
source="youtrack" AND ("<script>" OR "javascript:" OR "onerror=" OR "onload=") AND event_type="comment"