CVE-2026-86491: CWE-79 in JetBrains YouTrack
Description
CVE-2026-86491 is a stored cross-site scripting (XSS) vulnerability in JetBrains YouTrack versions before 2026.2.18634. The vulnerability arises from the ability to upload project and organization icons that can contain malicious scripts. This flaw allows an attacker with high privileges and user interaction to inject scripts that may impact confidentiality and integrity but does not affect availability. The vulnerability has a low CVSS score of 3.5, indicating limited impact. No known exploits are reported in the wild. JetBrains has not explicitly provided a patch link in the data, but the vulnerability is fixed in version 2026.2.18634. Users should upgrade to this version or later to remediate the issue.
CVSS v3.1
Score 3.5low
Affected software
JetBrains
YouTrack
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
JetBrains YouTrack before version 2026.2.18634 is affected by a stored XSS vulnerability (CWE-79) via project and organization icon uploads. This vulnerability allows an attacker with high privileges and requiring user interaction to inject malicious scripts that can compromise confidentiality and integrity. The CVSS 3.1 base score is 3.5, reflecting low severity. The vulnerability is fixed in version 2026.2.18634. No known exploits in the wild have been reported. The affected versions are all versions prior to 2026.2.18634.
Potential Impact
Successful exploitation could allow an attacker with high privileges to inject malicious scripts via icon uploads, potentially leading to limited confidentiality and integrity impacts. There is no impact on availability. No active exploitation is known.
Mitigation Recommendations
Upgrade JetBrains YouTrack to version 2026.2.18634 or later to remediate this stored XSS vulnerability. Since this is a fixed version, applying the official update is the recommended remediation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- JetBrains
- Date Reserved
- 2026-09-07T16:13:37.226Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a9ee859acd9273b49f0e418
Added to database: 09/07/2026, 16:37:45 UTC
Last enriched: 09/15/2026, 01:18:15 UTC
Last updated: 10/21/2026, 13:22:14 UTC
Views: 73
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