Cross-site scripting in YouTrack - CVE-2026-103489
Published: October 2, 2026
Vulnerability identifier: #VU153162
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-2026-103489
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to inject HTML into VCS command failure notifications.
The vulnerability exists due to improper neutralization of HTML input in VCS command failure notifications when rendering notification content. A remote attacker can cause a VCS command failure notification containing crafted HTML to be rendered to inject HTML into VCS command failure notifications.
Affected software
YouTrack
How to mitigate CVE-2026-103489
Install security update from vendor's website.
YouTrack - update to 2026.2.19422