What is CVE-2026-123289?

CVE-2026-123289 is a medium-severity vulnerability in Jetbrains Datalore, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2026-11-06.

How severe is CVE-2026-123289?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Auth bypass in Jetbrains Datalore

CVE-2026-123289

In JetBrains Datalore before 2026.4 improper authorisation allowed notebook viewers to modify files

Vulnerability class: Broken Access Control

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

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/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 Datalore

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

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

Frequently asked questions

What is CVE-2026-123289?: CVE-2026-123289 is a medium-severity vulnerability in Jetbrains Datalore, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2026-11-06.
How severe is CVE-2026-123289?: Medium severity. CVSS v3 base score is 5.4 out of 10.