CVE-2026-86489: CWE-639 in JetBrains YouTrack
Description
CVE-2026-86489 is an Insecure Direct Object Reference (IDOR) vulnerability in JetBrains YouTrack versions before 2026.2.18634. It affects the user profile API, allowing unauthorized disclosure of private issues and starred folders across organizations. The vulnerability has a CVSS 3.1 base score of 6.5, indicating medium severity. No known exploits are reported in the wild. JetBrains has not provided explicit patch information in the input data.
CVSS v3.1
Score 6.5medium
Affected software
JetBrains
YouTrack
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-639) in JetBrains YouTrack's user profile API allows an attacker with limited privileges to access private issues and starred folders belonging to other organizations due to improper access control (IDOR). The issue affects all versions prior to 2026.2.18634. The CVSS 3.1 vector indicates network attack vector, low attack complexity, low privileges required, no user interaction, unchanged scope, high confidentiality impact, no integrity or availability impact.
Potential Impact
Successful exploitation leads to unauthorized disclosure of sensitive data including private issues and starred folders across organizations. This compromises confidentiality but does not affect integrity or availability. There are no reports of active exploitation in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since the affected versions are prior to 2026.2.18634, upgrading to version 2026.2.18634 or later is recommended once the vendor confirms a fix. Until then, restrict access to the user profile API and monitor for suspicious activity related to unauthorized data access.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- JetBrains
- Date Reserved
- 2026-09-07T16:13:36.763Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a9ee859acd9273b49f0e413
Added to database: 09/07/2026, 16:37:45 UTC
Last enriched: 09/15/2026, 01:18:07 UTC
Last updated: 10/23/2026, 01:15:27 UTC
Views: 71
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.