Incorrect authorization in YouTrack - CVE-2026-100259
Published: October 2, 2026
Vulnerability identifier: #VU153136
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-100259
CWE-ID: CWE-863
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to modify Gantt chart data.
The vulnerability exists due to improper access control in the Gantt chart feature when handling Gantt chart edit requests. A remote user can submit an edit request despite having view-only access to modify Gantt chart data.
Exploitation requires view-only access.
Affected software
YouTrack
How to mitigate CVE-2026-100259
Install security update from vendor's website.
YouTrack - update to 2026.2.18991