CVE-2025-48391: JetBrains YouTrack Auth Bypass Vulnerability

CVE-2025-48391 Overview

CVE-2025-48391 is a Missing Authentication for Critical Function vulnerability (CWE-306) affecting JetBrains YouTrack before version 2025.1.76253. The vulnerability allows unauthorized deletion of issues through the API due to missing permission checks, enabling attackers to manipulate or destroy project data without proper authorization.

Critical Impact

Unauthorized users can delete issues via the YouTrack API without proper authentication or permission validation, potentially leading to significant data loss and project disruption.

Affected Products

• JetBrains YouTrack versions prior to 2025.1.76253

Discovery Timeline

• 2025-05-20 - CVE-2025-48391 published to NVD
• 2025-09-30 - Last updated in NVD database

Technical Details for CVE-2025-48391

Vulnerability Analysis

This vulnerability stems from inadequate access control enforcement in the JetBrains YouTrack API. The application fails to properly verify that API requests for issue deletion are made by authenticated users with appropriate permissions. This authorization bypass allows any user—or potentially unauthenticated actors—to invoke the issue deletion endpoint and permanently remove tracked issues from the system.

The impact is focused on integrity, as attackers can delete critical project data including bug reports, feature requests, and other tracked issues. While confidentiality and availability are not directly affected, the loss of issue data can significantly disrupt project management workflows and remove important historical tracking information.

Root Cause

The root cause is a Missing Authentication for Critical Function (CWE-306) vulnerability. The YouTrack API endpoint responsible for issue deletion does not implement proper permission checks before executing the delete operation. This oversight allows requests to bypass the expected authorization layer, enabling unauthorized data manipulation.

Attack Vector

The vulnerability is exploitable over the network with low attack complexity and requires no user interaction or prior authentication. An attacker can craft malicious API requests targeting the issue deletion endpoint to remove issues from YouTrack instances.

The attack flow involves:

1. Identifying an exposed YouTrack instance
2. Discovering or enumerating valid issue identifiers
3. Sending DELETE requests to the API endpoint without proper authorization credentials
4. Successfully removing issues from the target YouTrack project

Since no verified code examples are available, the vulnerability mechanism can be described as an API authorization bypass where the server fails to validate that the requesting user has the necessary permissions before processing issue deletion requests. For detailed technical information, refer to the JetBrains Security Issues Fixed advisory.

Detection Methods for CVE-2025-48391

Indicators of Compromise

• Unexpected or unauthorized issue deletions in YouTrack audit logs
• API requests to issue deletion endpoints from unrecognized IP addresses or user agents
• Unusual patterns of bulk issue deletion activity
• Authentication failures followed by successful deletion operations without proper authorization

Detection Strategies

• Monitor YouTrack audit logs for issue deletion events, particularly those without corresponding authorized user sessions
• Implement API request logging and analyze for anomalous deletion patterns
• Configure alerts for bulk deletion operations or deletions from untrusted network segments
• Review access logs for API endpoints related to issue management

Monitoring Recommendations

• Enable comprehensive audit logging in YouTrack to capture all issue modification and deletion events
• Implement network-level monitoring to detect unusual API traffic patterns
• Set up automated alerts for issue deletion operations outside of normal business workflows
• Regularly review and audit API access patterns and user permissions

How to Mitigate CVE-2025-48391

Immediate Actions Required

• Upgrade JetBrains YouTrack to version 2025.1.76253 or later immediately
• Audit recent issue deletion activity to identify potential unauthorized modifications
• Review API access logs for suspicious activity prior to patching
• Restrict network access to the YouTrack API to trusted IP ranges where possible

Patch Information

JetBrains has addressed this vulnerability in YouTrack version 2025.1.76253. Organizations should upgrade to this version or later to remediate the missing permission checks in the API. The security fix ensures proper authorization validation is performed before processing issue deletion requests.

For official patch information and security advisory details, see the JetBrains Security Issues Fixed page.

Workarounds

• Implement network-level access controls to restrict API access to trusted IP addresses only
• Configure web application firewall (WAF) rules to block unauthorized API deletion requests
• Temporarily disable external API access if the upgrade cannot be applied immediately
• Implement additional authentication layers such as API gateway controls or reverse proxy authentication

# Example: Restrict YouTrack API access at the network level using iptables
# Allow only trusted networks to access YouTrack API endpoints
iptables -A INPUT -p tcp --dport 8080 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -j DROP