Cross-site scripting in YouTrack - CVE-2026-100275
Published: October 2, 2026
Vulnerability identifier: #VU153152
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-2026-100275
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 script content in the workflow error notification toast when rendering stored workflow error notifications. A remote attacker can store malicious script content in a workflow error notification to execute arbitrary script in a victim's browser.
Exploitation requires a user to view the workflow error notification toast.
Affected software
YouTrack
How to mitigate CVE-2026-100275
Install security update from vendor's website.
YouTrack - update to 2026.2.19197