Reliance on IP Address for Authentication in YouTrack - CVE-2026-86485
Published: September 7, 2026
Vulnerability identifier: #VU147326
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-2026-86485
CWE-ID: CWE-291
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to forge Bitbucket webhooks.
The vulnerability exists due to improper validation of source IP addresses in Bitbucket webhook handling when sending HTTP requests with spoofed IP headers. A remote attacker can send HTTP requests with spoofed IP headers to forge Bitbucket webhooks.
Affected software
YouTrack
How to mitigate CVE-2026-86485
Install security update from vendor's website.
YouTrack - update to 2026.2.18634