What is CVE-2026-123319?

CVE-2026-123319 is a low-severity vulnerability in Jetbrains Ktor, classified under Reliance on Cookies without Validation and Integrity Checking. CVSS score: 3.7/10. Published 2026-11-06.

How severe is CVE-2026-123319?

Low severity. CVSS v3 base score is 3.7 out of 10.

Vulnerability in Jetbrains Ktor

CVE-2026-123319

In JetBrains Ktor before 3.6.1 missing Domain attribute validation in client cookie storage allowed cookie injection

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

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/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 Ktor

Weakness classification (CWE)

CWE-565 — Reliance on Cookies without Validation and Integrity Checking

References

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

Frequently asked questions

What is CVE-2026-123319?: CVE-2026-123319 is a low-severity vulnerability in Jetbrains Ktor, classified under Reliance on Cookies without Validation and Integrity Checking. CVSS score: 3.7/10. Published 2026-11-06.
How severe is CVE-2026-123319?: Low severity. CVSS v3 base score is 3.7 out of 10.