CVE-2026-86492: CWE-488 in JetBrains YouTrack
Description
CVE-2026-86492 is a high-severity vulnerability in JetBrains YouTrack before version 2026.2.18634. It involves a shared token cache that allowed cross-tenant theft of GitHub App installation tokens. This flaw could lead to unauthorized access to sensitive tokens across different tenants. The vulnerability has a CVSS score of 8.5, indicating a significant impact on confidentiality with limited integrity impact and no availability impact. No known exploits are reported in the wild. The affected versions are all releases prior to 2026.2.18634.
CVSS v3.1
Score 8.5high
Affected software
JetBrains
YouTrack
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-86492) in JetBrains YouTrack is due to improper isolation in a shared token cache, which allowed an attacker with limited privileges to steal GitHub App installation tokens belonging to other tenants. The issue is classified under CWE-488 (Exposure of Resource to Wrong Sphere). The flaw affects all versions before 2026.2.18634. The CVSS 3.1 vector indicates network attack vector, low attack complexity, low privileges required, no user interaction, scope changed, high confidentiality impact, low integrity impact, and no availability impact.
Potential Impact
An attacker with limited privileges could exploit this vulnerability to access GitHub App installation tokens from other tenants, potentially leading to unauthorized access to GitHub resources associated with those tokens. This compromises confidentiality but has limited impact on integrity and no impact on availability. There are no reports of active exploitation in the wild.
Mitigation Recommendations
A fix is available in JetBrains YouTrack version 2026.2.18634. Users should upgrade to this version or later to remediate the vulnerability. Since this is not a cloud service, remediation depends on user action to apply the update. Patch status is confirmed by the versioning information provided.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- JetBrains
- Date Reserved
- 2026-09-07T16:13:37.497Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a9ee859acd9273b49f0e41a
Added to database: 09/07/2026, 16:37:45 UTC
Last enriched: 09/15/2026, 01:18:24 UTC
Last updated: 10/22/2026, 01:15:26 UTC
Views: 89
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