What is CVE-2019-12866?

CVE-2019-12866 is a critical-severity vulnerability in Jetbrains Youtrack, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 9.8/10. Published 2019-07-03.

How severe is CVE-2019-12866?

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

Auth bypass in Jetbrains Youtrack

CVE-2019-12866

An Insecure Direct Object Reference, with Authorization Bypass through a User-Controlled Key, was possible in JetBrains YouTrack. The issue was fixed in 2018.4.49168.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2019-07-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.019 (79.9th percentile), scored 2026-10-23.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 79.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000

Affected products

Jetbrains Youtrack

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

blog.jetbrains.com/blog/2019/06/19/jetbrains-security-bulletin-q1-2019/ (Vendor Advisory)

Frequently asked questions

What is CVE-2019-12866?: CVE-2019-12866 is a critical-severity vulnerability in Jetbrains Youtrack, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 9.8/10. Published 2019-07-03.
How severe is CVE-2019-12866?: Critical severity. CVSS v3 base score is 9.8 out of 10.