Vulnerability Description
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 email before auto-linking by email, allowing a permissive provider account with a victim email address to be linked to the victim's local account. This issue is fixed in version 4.15.3.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/zitadel/zitadel/commit/c97012f0c5dc2fe960ae6e940cbea23229f055
- https://github.com/zitadel/zitadel/releases/tag/v4.15.3
- https://github.com/zitadel/zitadel/security/advisories/GHSA-992q-9gwp-7r79
FAQ
What is CVE-2026-56666?
CVE-2026-56666 is a vulnerability with a CVSS score of 4.8 (MEDIUM). 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 extern...
How severe is CVE-2026-56666?
CVE-2026-56666 has been rated MEDIUM with a CVSS base score of 4.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-56666?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.