Cross-site scripting in YouTrack - CVE-2026-103493
Published: October 2, 2026
Vulnerability identifier: #VU153158
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-2026-103493
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 improper neutralization of input during web page generation in Mermaid and LaTeX content rendering when rendering stored user-supplied Mermaid and LaTeX content. A remote user can store crafted Mermaid or LaTeX content to execute arbitrary script in a victim's browser.
User interaction is required for a victim to view the crafted content.
Affected software
YouTrack
How to mitigate CVE-2026-103493
Install security update from vendor's website.
YouTrack - update to 2026.2.19422