CVE-2026-56666: Zitadel

Medium severity, CVSS 4.8. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Zitadel Zitadel: before 4.15.3 (fixed in 4.15.3)

Published 2026-07-10. Last modified 2026-07-13.