What is CVE-2026-123281?

CVE-2026-123281 is a high-severity vulnerability in Jetbrains Datalore, classified under Argument Injection. CVSS score: 7.5/10. Published 2026-11-06.

How severe is CVE-2026-123281?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Jetbrains Datalore

CVE-2026-123281

In JetBrains Datalore before 2026.4 notebook code could execute commands in the sidecar container via the mount broker

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

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (30.5th percentile), scored 2026-11-09.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 30.5% 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-88 — Argument Injection

References

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

Frequently asked questions

What is CVE-2026-123281?: CVE-2026-123281 is a high-severity vulnerability in Jetbrains Datalore, classified under Argument Injection. CVSS score: 7.5/10. Published 2026-11-06.
How severe is CVE-2026-123281?: High severity. CVSS v3 base score is 7.5 out of 10.