What is CVE-2026-56668?

CVE-2026-56668 is a high-severity vulnerability in Zitadel, classified under Missing Authorization. CVSS score: 8.1/10. Published 2026-07-10.

How severe is CVE-2026-56668?

High severity. CVSS v3 base score is 8.1 out of 10.

Auth bypass in Zitadel

CVE-2026-56668

ZITADEL is an open source identity management platform. Prior to 4.15.3, ZITADEL's OAuth2 Token Exchange endpoint for urn:ietf:params:oauth:grant-type:token-exchange does not verify that the subject token belongs to the requesting client o…

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

Affected products

Zitadel — versions < 4.15.3

Weakness classification (CWE)

CWE-862 — Missing Authorization

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-2026-56668?: CVE-2026-56668 is a high-severity vulnerability in Zitadel, classified under Missing Authorization. CVSS score: 8.1/10. Published 2026-07-10.
How severe is CVE-2026-56668?: High severity. CVSS v3 base score is 8.1 out of 10.