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CVE-2026-23511

ZITADEL has a user enumeration vulnerability in Login UIs

CVSS 5.3 MEDIUMEPSS 0.4%CWE-204
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Affected products
zitadel · zitadel

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References
https://github.com/zitadel/zitadel/commit/b85ab69e4679b0268e2b0e9b4cd04e934af10dd2https://github.com/zitadel/zitadel/commit/c300d4cc6a2775ab17ddfe76492f24170f8b858dhttps://github.com/zitadel/zitadel/releases/tag/v3.4.6https://github.com/zitadel/zitadel/releases/tag/v4.9.1https://github.com/zitadel/zitadel/security/advisories/GHSA-pvm5-9frx-264r