What is CVE-2026-56666?

CVE-2026-56666 is a medium-severity vulnerability in Zitadel, classified under Improper Authentication. CVSS score: 4.8/10. Published 2026-07-10.

How severe is CVE-2026-56666?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Auth bypass in Zitadel

CVE-2026-56666

ZITADEL is an open source identity management platform. Prior to 4.15.3, ZITADEL's external identity provider handler checks that the local user's email is verified but does not verify that the external IdP confirmed ownership of the same…

Vulnerability class: Broken Authentication

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Zitadel — versions < 4.15.3

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-56666?: CVE-2026-56666 is a medium-severity vulnerability in Zitadel, classified under Improper Authentication. CVSS score: 4.8/10. Published 2026-07-10.
How severe is CVE-2026-56666?: Medium severity. CVSS v3 base score is 4.8 out of 10.