CVE-2026-49369 Overview
CVE-2026-49369 is an information disclosure vulnerability affecting JetBrains YouTrack versions prior to 2026.1.13162. The flaw resides in the Users and Groups pages, where insufficient authorization checks expose information to authenticated users who should not have access. The issue is classified under CWE-863: Incorrect Authorization.
An attacker with low-privilege network access can retrieve sensitive user and group metadata without elevated permissions. JetBrains addressed the issue in YouTrack 2026.1.13162 and published details in its JetBrains Security Issues Fixed advisory.
Critical Impact
Authenticated attackers can enumerate user and group data on YouTrack instances, exposing organizational structure and identity information useful for follow-on attacks.
Affected Products
- JetBrains YouTrack versions before 2026.1.13162
- Self-hosted YouTrack deployments using affected builds
- YouTrack instances exposed to authenticated internal or external users
Discovery Timeline
- 2026-05-29 - CVE-2026-49369 published to NVD
- 2026-06-01 - Last updated in NVD database
Technical Details for CVE-2026-49369
Vulnerability Analysis
The vulnerability is an authorization flaw on the Users and Groups pages of JetBrains YouTrack. The application fails to fully enforce access control checks when rendering or responding to requests for user and group resources. Authenticated users with low privileges can therefore retrieve information that should be restricted to administrators or users with elevated roles.
The weakness is mapped to CWE-863: Incorrect Authorization. Exploitation requires network access and a valid low-privilege account, but no user interaction. Impact is limited to confidentiality. Integrity and availability of the YouTrack instance are not affected.
Root Cause
The root cause is incomplete authorization enforcement on endpoints backing the Users and Groups pages. The application performs authentication checks but does not consistently validate whether the calling principal has the rights to view the requested resources. Disclosed data may include account identifiers, group memberships, and related metadata used to model organizational access.
Attack Vector
An attacker authenticates to YouTrack with any standard account. The attacker then requests user or group resources through the affected pages or their underlying API calls. The server returns data without performing the authorization checks expected for those resources. The attacker uses the disclosed data to map identities, group structures, and potential targets for privilege escalation or social engineering.
No public proof-of-concept or exploit code is listed in the JetBrains advisory at the time of writing. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.
Detection Methods for CVE-2026-49369
Indicators of Compromise
- Repeated authenticated requests from a single account to user and group endpoints within the YouTrack web application.
- Unusual enumeration patterns in YouTrack access logs targeting /users and /groups paths.
- Low-privilege accounts accessing administrative listing views outside of normal business activity.
Detection Strategies
- Review YouTrack audit logs for high-volume reads against Users and Groups resources by non-administrative accounts.
- Correlate web server access logs with YouTrack role assignments to identify privilege mismatches.
- Alert on accounts that issue broad listing queries shortly after authentication, which is atypical for standard users.
Monitoring Recommendations
- Forward YouTrack application and access logs to a centralized log platform for retention and analysis.
- Baseline normal usage of Users and Groups pages per role and alert on statistical deviations.
- Monitor authentication events for accounts that begin accessing identity-related endpoints they have not previously used.
How to Mitigate CVE-2026-49369
Immediate Actions Required
- Upgrade JetBrains YouTrack to version 2026.1.13162 or later as published in the JetBrains Security Issues Fixed advisory.
- Audit existing user accounts and remove inactive or unnecessary low-privilege accounts that could be abused for enumeration.
- Review access logs for the Users and Groups pages and investigate any anomalous activity from non-administrative accounts.
Patch Information
JetBrains fixed the issue in YouTrack 2026.1.13162. Administrators of self-hosted instances should apply the upgrade following the standard YouTrack upgrade procedure. Cloud-hosted YouTrack instances managed by JetBrains receive the fix automatically. Verify the installed build number after upgrade to confirm the patch is in place.
Workarounds
- Restrict YouTrack access to trusted networks using a VPN or IP allowlist until patching is complete.
- Enforce least-privilege role assignments and remove broad permissions granted to standard users.
- Require multi-factor authentication for all YouTrack accounts to reduce the risk of attackers obtaining the credentials needed to exploit the flaw.
# Verify the installed YouTrack version after upgrade
curl -s -u <admin_user>:<admin_token> \
https://<youtrack-host>/api/config?fields=version
# Expected output should show version 2026.1.13162 or later
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
