What is CVE-2026-123286?

CVE-2026-123286 is a medium-severity vulnerability in Jetbrains Datalore, classified under Incorrect Authorization. CVSS score: 5.9/10. Published 2026-11-06.

How severe is CVE-2026-123286?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Auth bypass in Jetbrains Datalore

CVE-2026-123286

In JetBrains Datalore before 2026.4 improper authorisation allowed read the notebook owner's file storage session token

Vulnerability class: Broken Access Control

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

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (7.5th percentile), scored 2026-11-09.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 7.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

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-2026-123286?: CVE-2026-123286 is a medium-severity vulnerability in Jetbrains Datalore, classified under Incorrect Authorization. CVSS score: 5.9/10. Published 2026-11-06.
How severe is CVE-2026-123286?: Medium severity. CVSS v3 base score is 5.9 out of 10.