What is CVE-2026-86478?

CVE-2026-86478 is a critical-severity vulnerability in Jetbrains Youtrack, classified under Authentication Bypass by Spoofing. CVSS score: 9.8/10. Published 2026-09-07.

How severe is CVE-2026-86478?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Jetbrains Youtrack

CVE-2026-86478

In JetBrains YouTrack before 2025.3.161254, 2026.1.14042 improper authentication in YouTrack Helpdesk allowed unauthenticated account takeover via a self-asserted email address

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Jetbrains Youtrack

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

cve@jetbrains.com

Frequently asked questions

What is CVE-2026-86478?: CVE-2026-86478 is a critical-severity vulnerability in Jetbrains Youtrack, classified under Authentication Bypass by Spoofing. CVSS score: 9.8/10. Published 2026-09-07.
How severe is CVE-2026-86478?: Critical severity. CVSS v3 base score is 9.8 out of 10.