Missing Authentication for Critical Function in YouTrack - CVE-2026-86486
Published: September 7, 2026
Vulnerability identifier: #VU147325
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-86486
CWE-ID: CWE-306
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to submit unauthenticated webhook requests.
The vulnerability exists due to missing authentication in the generic VCS webhook handler when its secret is blank. A remote attacker can send a webhook request without providing a valid secret to submit unauthenticated webhook requests.
Affected software
YouTrack
How to mitigate CVE-2026-86486
Install security update from vendor's website.
YouTrack - update to 2026.2.18634