What is CVE-2026-123290?

CVE-2026-123290 is a medium-severity vulnerability in Jetbrains Datalore, classified under Insertion of Sensitive Information into Sent Data. CVSS score: 5.3/10. Published 2026-11-06.

How severe is CVE-2026-123290?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Jetbrains Datalore

CVE-2026-123290

In JetBrains Datalore before 2026.4 hidden notebook code was exposed to unauthenticated users via the public interactive report content endpoint

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

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (25.0th percentile), scored 2026-11-09.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 25.0% 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-201 — Insertion of Sensitive Information into Sent Data

References

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

Frequently asked questions

What is CVE-2026-123290?: CVE-2026-123290 is a medium-severity vulnerability in Jetbrains Datalore, classified under Insertion of Sensitive Information into Sent Data. CVSS score: 5.3/10. Published 2026-11-06.
How severe is CVE-2026-123290?: Medium severity. CVSS v3 base score is 5.3 out of 10.