CVE-2025-53959 Overview
CVE-2025-53959 affects JetBrains YouTrack, a project management and issue tracking platform. The vulnerability allows email spoofing through an administrative API endpoint. An authenticated user with low privileges can send emails that appear to originate from trusted YouTrack addresses. JetBrains addressed the issue in YouTrack versions 2025.2.86069, 2024.3.85077, and 2025.1.86199. The flaw is classified under CWE-862 (Missing Authorization). Exploitation requires user interaction on the receiving end, typically through phishing-style email content. Successful abuse undermines email-based trust and enables targeted social engineering against YouTrack users and administrators.
Critical Impact
Attackers with low-privilege access can spoof emails through YouTrack's administrative API, enabling phishing campaigns that abuse the trust of the YouTrack mail infrastructure.
Affected Products
- JetBrains YouTrack versions prior to 2025.2.86069
- JetBrains YouTrack versions prior to 2024.3.85077
- JetBrains YouTrack versions prior to 2025.1.86199
Discovery Timeline
- 2025-07-15 - CVE-2025-53959 published to NVD
- 2025-10-14 - Last updated in NVD database
Technical Details for CVE-2025-53959
Vulnerability Analysis
The vulnerability stems from missing authorization checks on an administrative API endpoint in JetBrains YouTrack. The endpoint exposes email-sending functionality without enforcing proper privilege validation. As a result, callers without administrative rights can craft outbound emails using the YouTrack instance as the sender. The flaw maps to CWE-862, Missing Authorization. Because the spoofed messages originate from a legitimate YouTrack server, downstream mail filters and recipients are likely to treat them as trusted. This significantly raises the success rate of targeted phishing or business email compromise scenarios that pivot through YouTrack.
Root Cause
The administrative API path responsible for email operations did not verify whether the caller held administrator privileges. The authorization layer permitted low-privilege authenticated users to reach functionality reserved for administrators. The fix introduces proper privilege enforcement on the affected endpoint.
Attack Vector
An attacker first obtains a low-privilege authenticated session on the target YouTrack instance. The attacker then issues a crafted request to the vulnerable administrative API to dispatch emails with attacker-controlled content and sender attributes. Recipients receive messages that pass SPF, DKIM, and DMARC alignment because YouTrack's mail infrastructure is the actual sender. User interaction on the recipient side is required for full impact, such as clicking links or executing instructions in the spoofed message.
No verified public proof-of-concept is available. See the JetBrains Security Issues Fixed advisory for vendor details.
Detection Methods for CVE-2025-53959
Indicators of Compromise
- Unexpected outbound emails from the YouTrack instance that were not initiated by administrators or workflow rules
- Administrative API calls related to email functionality originating from non-administrator accounts
- User reports of phishing emails sent from legitimate YouTrack addresses containing unusual links or requests
Detection Strategies
- Review YouTrack audit logs for invocations of email-related administrative API endpoints by non-administrative accounts
- Correlate mail server send logs with YouTrack API access logs to identify message bursts tied to low-privilege sessions
- Hunt for anomalous authentication patterns followed by administrative API requests, particularly from new or rarely used accounts
Monitoring Recommendations
- Forward YouTrack application and access logs to a centralized SIEM for retention and correlation
- Alert on outbound email volume spikes from the YouTrack mail relay
- Track privilege usage on the YouTrack REST API, focusing on endpoints associated with notifications and email delivery
How to Mitigate CVE-2025-53959
Immediate Actions Required
- Upgrade YouTrack to version 2025.2.86069, 2024.3.85077, or 2025.1.86199 or later, depending on your release branch
- Audit all YouTrack accounts and revoke unused or excessive permissions
- Review recent outbound email activity from the YouTrack instance for evidence of spoofing
- Notify users who may have received phishing emails originating from the YouTrack mail infrastructure
Patch Information
JetBrains has released fixed versions 2025.2.86069, 2024.3.85077, and 2025.1.86199. Refer to the JetBrains Security Issues Fixed advisory for release details and upgrade guidance.
Workarounds
- Restrict network access to the YouTrack administrative API to trusted management networks until patching is complete
- Limit account creation and enforce least-privilege role assignments to reduce the population of accounts that can authenticate to the API
- Monitor and rate-limit outbound mail from the YouTrack server at the mail relay to contain abuse if exploitation occurs
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
