Moderate severityOSV Advisory· Published Jan 15, 2026· Updated Jan 15, 2026
ZITADEL has a user enumeration vulnerability in Login UIs
CVE-2026-23511
Description
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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/zitadel/zitadelGo | >= 4.0.0, < 4.9.1 | 4.9.1 |
github.com/zitadel/zitadelGo | < 3.4.6 | 3.4.6 |
Affected products
3- ghsa-coords2 versionspkg:golang/github.com/zitadel/zitadelpkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Leap%2015.6
>= 4.0.0, < 4.9.1+ 1 more
- (no CPE)range: >= 4.0.0, < 4.9.1
- (no CPE)range: < 0.0.20260123T022811-150000.1.140.1
Patches
Vulnerability mechanics
References
8- github.com/advisories/GHSA-pvm5-9frx-264rghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-23511ghsaADVISORY
- github.com/zitadel/zitadel/commit/0bb00dd9fc4e5e965f8e14fa2161a5076f3c308dghsaWEB
- github.com/zitadel/zitadel/commit/b85ab69e4679b0268e2b0e9b4cd04e934af10dd2ghsax_refsource_MISCWEB
- github.com/zitadel/zitadel/commit/c300d4cc6a2775ab17ddfe76492f24170f8b858dghsax_refsource_MISCWEB
- github.com/zitadel/zitadel/releases/tag/v3.4.6ghsax_refsource_MISCWEB
- github.com/zitadel/zitadel/releases/tag/v4.9.1ghsax_refsource_MISCWEB
- github.com/zitadel/zitadel/security/advisories/GHSA-pvm5-9frx-264rghsax_refsource_CONFIRMWEB
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