What is CVE-2026-123277?

CVE-2026-123277 is a medium-severity vulnerability in Jetbrains Clion, classified under Missing Authentication for Critical Function. CVSS score: 5.0/10. Published 2026-11-06.

How severe is CVE-2026-123277?

Medium severity. CVSS v3 base score is 5.0 out of 10.

Auth bypass in Jetbrains Clion

CVE-2026-123277

In JetBrains CLion before 2026.3, 2026.2.4.1 missing authentication allowed local users to obtain the debug session environment on Linux

Vulnerability class: Broken Authentication

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

CVSS v3 metric

CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:L.

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 Clion

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

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

Frequently asked questions

What is CVE-2026-123277?: CVE-2026-123277 is a medium-severity vulnerability in Jetbrains Clion, classified under Missing Authentication for Critical Function. CVSS score: 5.0/10. Published 2026-11-06.
How severe is CVE-2026-123277?: Medium severity. CVSS v3 base score is 5.0 out of 10.