What is CVE-2026-123288?

CVE-2026-123288 is a medium-severity vulnerability in Jetbrains Datalore, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-11-06.

How severe is CVE-2026-123288?

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

XSS in Jetbrains Datalore

CVE-2026-123288

In JetBrains Datalore before 2026.4 stored XSS in notebook charts was possible via Vega editor link

Vulnerability class: XSS (Cross-Site Scripting)

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:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (48.2th percentile), scored 2026-11-09.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.2% 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-79 — Cross-site Scripting

References

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

Frequently asked questions

What is CVE-2026-123288?: CVE-2026-123288 is a medium-severity vulnerability in Jetbrains Datalore, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-11-06.
How severe is CVE-2026-123288?: Medium severity. CVSS v3 base score is 5.4 out of 10.