What is CVE-2026-123851?

CVE-2026-123851 is a medium-severity vulnerability in Jetbrains Junie GitHub Action, classified under CWE-180. CVSS score: 5.4/10. Published 2026-11-06.

How severe is CVE-2026-123851?

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

Vulnerability in Jetbrains Junie GitHub Action

CVE-2026-123851

In JetBrains Junie GitHub Action before 1.6.4 prompt injection protection could be bypassed via HTML-encoded characters

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

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Jetbrains Junie GitHub Action

Weakness classification (CWE)

CWE-180

References

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

Frequently asked questions

What is CVE-2026-123851?: CVE-2026-123851 is a medium-severity vulnerability in Jetbrains Junie GitHub Action, classified under CWE-180. CVSS score: 5.4/10. Published 2026-11-06.
How severe is CVE-2026-123851?: Medium severity. CVSS v3 base score is 5.4 out of 10.