Cross-site scripting in YouTrack - CVE-2026-86483
Published: September 7, 2026
Vulnerability identifier: #VU147328
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-86483
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary script in a victim\'s browser.
The vulnerability exists due to stored cross-site scripting in custom fields on Agile board cards when displaying an Agile board card containing a crafted custom field. A remote user can inject a malicious script into a custom field to execute arbitrary script in a victim\'s browser.
User interaction is required to view the affected Agile board card.
Affected software
YouTrack
How to mitigate CVE-2026-86483
Install security update from vendor's website.
YouTrack - update to 2026.2.18634