CVE-2025-59455
📋 TL;DR
This CVE describes a project isolation bypass vulnerability in JetBrains TeamCity due to a race condition. Attackers could potentially access or modify project data they shouldn't have permission to view. This affects all TeamCity instances running versions before 2025.07.2.
💻 Affected Systems
- JetBrains TeamCity
📦 What is this software?
Teamcity by Jetbrains
⚠️ Risk & Real-World Impact
Worst Case
An attacker could access sensitive project data, modify build configurations, or exfiltrate source code and credentials from unauthorized projects.
Likely Case
Unauthorized access to project data or configuration files within the TeamCity instance.
If Mitigated
Limited impact if proper network segmentation and access controls are in place, though isolation bypass remains possible.
🎯 Exploit Status
Exploitation requires race condition timing and some level of access to the TeamCity instance. No public exploit code is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2025.07.2 or later
Vendor Advisory: https://www.jetbrains.com/privacy-security/issues-fixed/
Restart Required: No
Instructions:
1. Backup your TeamCity instance. 2. Download TeamCity 2025.07.2 or later from the JetBrains website. 3. Follow the TeamCity upgrade documentation for your installation type. 4. Verify the upgrade completed successfully.
🔧 Temporary Workarounds
Temporary access restriction
allLimit user access to only necessary projects and implement stricter access controls while awaiting patch.
Review and tighten TeamCity project permissions via Administration > Users/Groups > Project Permissions
🧯 If You Can't Patch
- Implement strict network segmentation to isolate TeamCity from sensitive networks
- Enable detailed audit logging and monitor for unusual project access patterns
🔍 How to Verify
Check if Vulnerable:
Check TeamCity version via Administration > Server Administration > Server Health > VersionCheck Version:
Check TeamCity web interface at Administration > Server Administration > Server HealthVerify Fix Applied:
Verify version is 2025.07.2 or higher and test project isolation with controlled access tests📡 Detection & Monitoring
Log Indicators:
- Unusual project access patterns
- Multiple rapid access attempts to different projects
- Access denied errors followed by successful access
Network Indicators:
- Unusual API call sequences to project endpoints
- Rapid sequential requests to different project resources
SIEM Query:
source="teamcity" AND ("project access" OR "permission denied") | stats count by user, project, action