Incorrect authorization in YouTrack - CVE-2026-100277
Published: October 2, 2026
Vulnerability identifier: #VU153154
CSH Severity: Medium
CVSS v4: 9.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-100277
CWE-ID: CWE-863
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to take over accounts.
The vulnerability exists due to improper authorization in notification signature handling when processing a replayed notification signature. A remote attacker can replay a notification signature to take over accounts.
Affected software
YouTrack
How to mitigate CVE-2026-100277
Install security update from vendor's website.
YouTrack - update to 2026.2.19197