Cross-site scripting in YouTrack - CVE-2026-86484
Published: September 7, 2026
Vulnerability identifier: #VU147327
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-86484
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary script in a victim\'s browser.
The vulnerability exists due to improper neutralization of AngularJS template expressions in assignee names when rendering assignee names. A remote attacker can inject a malicious AngularJS template into an assignee name to execute arbitrary script in a victim\'s browser.
User interaction is required to view content containing the affected assignee name.
Affected software
YouTrack
How to mitigate CVE-2026-86484
Install security update from vendor's website.
YouTrack - update to 2026.2.18634