What is CVE-2026-123307?

CVE-2026-123307 is a medium-severity vulnerability in Jetbrains Intellij Idea, classified under Server-Side Request Forgery (SSRF). CVSS score: 6.8/10. Published 2026-11-06.

How severe is CVE-2026-123307?

Medium severity. CVSS v3 base score is 6.8 out of 10.

SSRF in Jetbrains Intellij Idea

CVE-2026-123307

In JetBrains IntelliJ IDEA before 2026.3, 2026.2.4 unauthenticated connection to an arbitrary host via run configurations was possible

Vulnerability class: SSRF (Server-Side Request Forgery)

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

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.003 (19.8th percentile), scored 2026-11-09.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.8% 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-918 — Server-Side Request Forgery (SSRF)

References

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

Frequently asked questions

What is CVE-2026-123307?: CVE-2026-123307 is a medium-severity vulnerability in Jetbrains Intellij Idea, classified under Server-Side Request Forgery (SSRF). CVSS score: 6.8/10. Published 2026-11-06.
How severe is CVE-2026-123307?: Medium severity. CVSS v3 base score is 6.8 out of 10.