CVE-2026-56664: Zitadel

Medium severity, CVSS 4.2. EPSS: 0.3% chance of exploitation in the next 30 days.

ZITADEL is an open source identity management platform. Prior to 3.4.12 and 4.15.2, ZITADEL's external JWT Identity Provider validation in internal/idp/providers/jwt/session.go skips the maximum token age freshness check when an incoming token omits the iat claim, allowing arbitrarily old tokens from a trusted issuer to pass authentication. This issue is fixed in versions 3.4.12 and 4.15.2.

Affected products

• Zitadel Zitadel: from 4.0.0-rc.1, before 4.15.2 (fixed in 4.15.2); before 3.4.12 (fixed in 3.4.12)

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