CVE-2025-53959
📋 TL;DR
This vulnerability allows attackers to spoof emails through an administrative API in JetBrains YouTrack. Attackers could send emails appearing to come from legitimate sources, potentially tricking users into revealing credentials or executing malicious actions. Organizations running vulnerable YouTrack instances are affected.
💻 Affected Systems
- JetBrains YouTrack
📦 What is this software?
Youtrack by Jetbrains
Youtrack by Jetbrains
⚠️ Risk & Real-World Impact
Worst Case
Attackers could send convincing phishing emails to all YouTrack users, leading to credential theft, malware installation, or unauthorized access to sensitive systems.
Likely Case
Targeted phishing campaigns against YouTrack users, potentially compromising individual accounts or extracting sensitive project information.
If Mitigated
Limited impact if email security controls are strong, but still creates trust erosion and potential for targeted attacks.
🎯 Exploit Status
Exploitation requires administrative API access, but once obtained, email spoofing is straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2025.2.86069, 2024.3.85077, or 2025.1.86199
Vendor Advisory: https://www.jetbrains.com/privacy-security/issues-fixed/
Restart Required: Yes
Instructions:
1. Backup your YouTrack instance. 2. Download the patched version from JetBrains. 3. Follow JetBrains upgrade documentation. 4. Restart the YouTrack service. 5. Verify the version is updated.
🔧 Temporary Workarounds
Restrict Administrative API Access
allLimit access to administrative APIs to only trusted IP addresses and users.
Configure firewall rules to restrict access to YouTrack administrative endpoints
Review and tighten user permissions in YouTrack
Email Security Controls
allImplement email authentication and filtering to detect spoofed emails.
Configure SPF, DKIM, and DMARC records
Enable email filtering for suspicious patterns
🧯 If You Can't Patch
- Implement strict network segmentation to isolate YouTrack from other critical systems
- Enable comprehensive logging and monitoring of administrative API access
🔍 How to Verify
Check if Vulnerable:
Check your YouTrack version in the administration panel or via the API. If it's below the patched versions, you are vulnerable.Check Version:
curl -s http://youtrack-instance/rest/admin/version | grep versionVerify Fix Applied:
After patching, verify the version shows 2025.2.86069, 2024.3.85077, or 2025.1.86199 or higher.📡 Detection & Monitoring
Log Indicators:
- Unusual administrative API calls related to email functionality
- Multiple email sending attempts from administrative accounts
Network Indicators:
- Suspicious email traffic originating from YouTrack server
- Unusual API access patterns to administrative endpoints
SIEM Query:
source="youtrack" AND (api_endpoint="*/admin/email*" OR action="send_email")