CVE-2026-56666 PUBLISHED

ZITADEL: Auto-linking by email: IdP-side email verification is not checked

Assigner: GitHub_M
Reserved: 22.06.2026 Published: 10.07.2026 Updated: 10.07.2026

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.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS Score: 4.8

Product Status

Vendor zitadel
Product zitadel
Versions
  • Version < 4.15.3 is affected

References

Problem Types

  • CWE-287: Improper Authentication CWE