CVE-2026-23511

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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
GitHub_MCNA
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CISA-ADPADP
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Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Common Weakness Enumeration
References
https://github.com/zitadel/zitadel/commit/b85ab69e4679b0268e2b0e9b4cd04e934af10dd2
https://github.com/zitadel/zitadel/commit/c300d4cc6a2775ab17ddfe76492f24170f8b858d
https://github.com/zitadel/zitadel/releases/tag/v3.4.6
https://github.com/zitadel/zitadel/releases/tag/v4.9.1
https://github.com/zitadel/zitadel/security/advisories/GHSA-pvm5-9frx-264r