What is CVE-2026-123291?

CVE-2026-123291 is a medium-severity vulnerability in Jetbrains Datalore, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-11-06.

How severe is CVE-2026-123291?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Jetbrains Datalore

CVE-2026-123291

In JetBrains Datalore before 2026.4 improper owner validation allowed reading another workspace's issues and runs notebook

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2026-11-06 · last modified 2026-11-06.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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 Datalore

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-2026-123291?: CVE-2026-123291 is a medium-severity vulnerability in Jetbrains Datalore, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-11-06.
How severe is CVE-2026-123291?: Medium severity. CVSS v3 base score is 4.3 out of 10.