What is CVE-2026-123308?

CVE-2026-123308 is a medium-severity vulnerability in Jetbrains Intellij Idea, classified under Inclusion of Functionality from Untrusted Control Sphere. CVSS score: 6.3/10. Published 2026-11-06.

How severe is CVE-2026-123308?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Vulnerability in Jetbrains Intellij Idea

CVE-2026-123308

In JetBrains IntelliJ IDEA before 2026.3 code execution via the document import was possible in untrusted projects

Published 2026-11-06 · last modified 2026-11-07.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.001 (3.5th percentile), scored 2026-11-09.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 3.5% 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 Intellij Idea

Weakness classification (CWE)

CWE-829 — Inclusion of Functionality from Untrusted Control Sphere

References

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

Frequently asked questions

What is CVE-2026-123308?: CVE-2026-123308 is a medium-severity vulnerability in Jetbrains Intellij Idea, classified under Inclusion of Functionality from Untrusted Control Sphere. CVSS score: 6.3/10. Published 2026-11-06.
How severe is CVE-2026-123308?: Medium severity. CVSS v3 base score is 6.3 out of 10.