CVE-2026-86481: CWE-639 in JetBrains YouTrack
Description
CVE-2026-86481 is a medium severity vulnerability in JetBrains YouTrack before version 2026.2.18634. It involves signed URL reuse that allows unauthorized disclosure of restricted project icons. The vulnerability is related to CWE-639, which concerns authorization bypass through URL manipulation. No known exploits are reported in the wild. The vulnerability affects versions from initial releases up to but not including 2026.2.18634.
CVSS v3.1
Score 4.3medium
Affected software
JetBrains
YouTrack
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in JetBrains YouTrack allows an attacker with limited privileges to reuse signed URLs to access restricted project icons that should not be disclosed. The issue is classified under CWE-639, indicating improper authorization checks when reusing signed URLs. The vulnerability affects all versions prior to 2026.2.18634. The CVSS 3.1 base score is 4.3, reflecting a network attack vector with low complexity, requiring privileges but no user interaction, and resulting in limited confidentiality impact without integrity or availability impact.
Potential Impact
An attacker with some level of privileges can reuse signed URLs to view restricted project icons that should be confidential. The impact is limited to information disclosure of project icons, with no reported impact on integrity or availability. There are no known active exploits 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, manual patching is required. No additional mitigations are specified.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- JetBrains
- Date Reserved
- 2026-09-07T16:13:34.326Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a9ee857acd9273b49f0e3e4
Added to database: 09/07/2026, 16:37:43 UTC
Last enriched: 09/15/2026, 01:17:31 UTC
Last updated: 10/21/2026, 13:22:13 UTC
Views: 79
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