CVE-2026-86483: CWE-79 in JetBrains YouTrack
Description
CVE-2026-86483 is a stored cross-site scripting (XSS) vulnerability in JetBrains YouTrack versions before 2026.2.18634. The issue arises from a custom field on Agile board cards that allows malicious scripts to be stored and executed. This vulnerability has a medium severity rating with a CVSS score of 5.4. It requires low privileges and user interaction to exploit and can lead to partial confidentiality and integrity impacts without affecting availability.
CVSS v3.1
Score 5.4medium
Affected software
JetBrains
YouTrack
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 versions prior to 2026.2.18634 contain a stored XSS vulnerability (CWE-79) via a custom field on Agile board cards. This flaw allows an attacker with low privileges to inject malicious scripts that are stored and later executed in the context of other users, potentially compromising confidentiality and integrity of data. The vulnerability has a CVSS 3.1 base score of 5.4, indicating medium severity. No known exploits are reported in the wild, and the product is not a cloud service.
Potential Impact
Successful exploitation can lead to execution of malicious scripts in the context of authenticated users, potentially exposing sensitive information or allowing unauthorized actions within the affected YouTrack instance. The impact affects confidentiality and integrity but does not impact availability. The attack requires low privileges and user interaction.
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 version information; no additional vendor advisory was provided.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- JetBrains
- Date Reserved
- 2026-09-07T16:13:35.041Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a9ee857acd9273b49f0e3e8
Added to database: 09/07/2026, 16:37:43 UTC
Last enriched: 09/15/2026, 01:17:35 UTC
Last updated: 10/22/2026, 13:15:24 UTC
Views: 112
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