{"cve":"CVE-2026-23511","nvd":{"published":"2026-01-15T20:16:05.167","modified":"2026-06-17T10:21:42.183","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","score":5.3},"cwes":["CWE-204"],"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"],"products":["zitadel:zitadel"],"source":"nvd","synced_at":"2026-10-19T22:19:41.481987139+00:00"},"epss":{"cve":"CVE-2026-23511","score":0.00402,"percentile":0.34446,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-pvm5-9frx-264r","url":"https://osv.dev/vulnerability/GHSA-pvm5-9frx-264r","summary":"Zitadel has a user enumeration vulnerability in Login UIs","modified":"2026-02-03T03:11:30.555128Z","packages":[{"ecosystem":"Go","name":"github.com/zitadel/zitadel","purl":"pkg:golang/github.com/zitadel/zitadel","ranges":[">=4.0.0 <4.9.1"],"fixed":["4.9.1"]},{"ecosystem":"Go","name":"github.com/zitadel/zitadel","purl":"pkg:golang/github.com/zitadel/zitadel","ranges":["<3.4.6"],"fixed":["3.4.6"]}]},{"id":"GO-2026-4319","url":"https://osv.dev/vulnerability/GO-2026-4319","summary":"Zitadel has a user enumeration vulnerability in Login UIs in github.com/zitadel/zitadel","modified":"2026-01-23T02:56:14.128312Z","packages":[{"ecosystem":"Go","name":"github.com/zitadel/zitadel","purl":"pkg:golang/github.com/zitadel/zitadel","ranges":["all versions"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}