CVE-2026-23511: Zitadel

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

ZITADEL is an open source identity management platform. Prior to 4.9.1 and 3.4.6, a user enumeration vulnerability has been discovered in Zitadel's login interfaces. An unauthenticated attacker can exploit this flaw to confirm the existence of valid user accounts by iterating through usernames and userIDs. This vulnerability is fixed in 4.9.1 and 3.4.6.

Affected products

• Zitadel Zitadel: from 2.0.0, up to and including 2.71.19; from 3.0.0, before 3.4.6 (fixed in 3.4.6); from 4.0.0, before 4.9.1 (fixed in 4.9.1)

Published 2026-01-15. Last modified 2026-06-17.