What is CVE-2026-103491?

CVE-2026-103491 is a medium-severity vulnerability in Jetbrains Youtrack, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-10-01.

How severe is CVE-2026-103491?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Jetbrains Youtrack

CVE-2026-103491

In JetBrains YouTrack before 2026.2.19422 iDOR in the issue activities API allowed reading restricted issues

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2026-10-01 · last modified 2026-10-01.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

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-639 — Authorization Bypass Through User-Controlled Key

References

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

Frequently asked questions

What is CVE-2026-103491?: CVE-2026-103491 is a medium-severity vulnerability in Jetbrains Youtrack, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-10-01.
How severe is CVE-2026-103491?: Medium severity. CVSS v3 base score is 6.5 out of 10.