What is CVE-2026-49378?

CVE-2026-49378 is a medium-severity vulnerability in Jetbrains Teamcity, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-05-29.

How severe is CVE-2026-49378?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Jetbrains Teamcity

CVE-2026-49378

In JetBrains TeamCity before 2026.1 credentials parameters were exposed via parameter autocompletion

Vulnerability class: Broken Access Control

EPSS: 0.000 (0.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

Affected products

Jetbrains Teamcity — versions 0

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

cve@jetbrains.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-49378?: CVE-2026-49378 is a medium-severity vulnerability in Jetbrains Teamcity, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-05-29.
How severe is CVE-2026-49378?: Medium severity. CVSS v3 base score is 4.3 out of 10.