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.
https://github.com/zitadel/zitadel/security/advisories/GHSA-pvm5-9frx-264r
https://github.com/zitadel/zitadel/releases/tag/v4.9.1
https://github.com/zitadel/zitadel/releases/tag/v3.4.6
https://github.com/zitadel/zitadel/commit/c300d4cc6a2775ab17ddfe76492f24170f8b858d
https://github.com/zitadel/zitadel/commit/b85ab69e4679b0268e2b0e9b4cd04e934af10dd2