CVE-2026-86491: CWE-79 in JetBrains YouTrack
Description
In JetBrains YouTrack before 2026.2.18634 stored XSS was possible via project and organization icon uploads
CVSS v3.1
Score 3.5low
Affected software
pkg:github/jetbrains/YouTrackRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
JetBrains YouTrack before version 2026.2.18634 is affected by a stored XSS vulnerability (CVE-2026-86491) that can be exploited through project and organization icon uploads. This vulnerability allows an attacker with high privileges to inject malicious scripts that are stored and later executed when viewed by users. The CVSS 3.1 base score is 3.5, reflecting low impact on confidentiality and integrity, and no impact on availability. Exploitation requires user interaction and high privileges.
Potential Impact
Successful exploitation could lead to limited confidentiality and integrity impact by executing malicious scripts in the context of the affected application. There is no impact on availability. The vulnerability requires high privileges and user interaction, limiting the scope of potential attacks. No active exploitation in the wild has been reported.
Mitigation Recommendations
Upgrade JetBrains YouTrack to version 2026.2.18634 or later, where this stored XSS vulnerability has been fixed. No additional mitigation steps are indicated by the vendor advisory or source data.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-m4mg-c2jx-4939
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-86491"]
- Database Specific Severity
- LOW
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a9f9115acd9273b49ff2bf4
Added to database: 09/08/2026, 04:37:41 UTC
Last enriched: 09/08/2026, 04:53:59 UTC
Last updated: 10/23/2026, 01:15:27 UTC
Views: 77
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