What is CVE-2026-100277?

CVE-2026-100277 is a high-severity vulnerability in Jetbrains Youtrack, classified under Incorrect Authorization. CVSS score: 8.9/10. Published 2026-09-30.

How severe is CVE-2026-100277?

High severity. CVSS v3 base score is 8.9 out of 10.

Auth bypass in Jetbrains Youtrack

CVE-2026-100277

In JetBrains YouTrack before 2026.2.19197 account takeover was possible by replaying a notification signature

Vulnerability class: Broken Access Control

Published 2026-09-30 · last modified 2026-09-30.

CVSS v3 metric

CVSS v3 base score 8.9 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Jetbrains Youtrack

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

www.jetbrains.com/privacy-security/issues-fixed/

Frequently asked questions

What is CVE-2026-100277?: CVE-2026-100277 is a high-severity vulnerability in Jetbrains Youtrack, classified under Incorrect Authorization. CVSS score: 8.9/10. Published 2026-09-30.
How severe is CVE-2026-100277?: High severity. CVSS v3 base score is 8.9 out of 10.