{"id":"CVE-2026-4633","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-4633","summary":"Keycloak's identity-first login flow exposes user information","details":"A flaw was found in Keycloak. A remote attacker can exploit differential error messages during the identity-first login flow when Organizations are enabled. This vulnerability allows an attacker to determine the existence of users, leading to information disclosure through user enumeration.","published":"2026-03-23T12:30:30Z","modified":"2026-09-10T03:50:40.968907299Z","cvss":{"score":3.7,"severity":"LOW","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"},"epss":{"score":0.00318,"percentile":0.24036,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.keycloak:keycloak-services","fixedVersion":"26.6.1"},{"ecosystem":"Maven","name":"org.keycloak:keycloak-services","fixedVersion":"26.4.12"}],"fix":{"url":"https://github.com/keycloak/keycloak/pull/47635","label":"keycloak/keycloak#47635"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4633"},{"type":"WEB","url":"https://github.com/keycloak/keycloak/issues/47619"},{"type":"WEB","url":"https://github.com/keycloak/keycloak/pull/47635"},{"type":"WEB","url":"https://github.com/keycloak/keycloak/commit/b137016cc6dcfd9f59b2aa2e6d73af8b0ebf7c6e"},{"type":"WEB","url":"https://github.com/keycloak/keycloak/commit/b4558a874fa79341404ae4d2d8f240f22bfed340"},{"type":"WEB","url":"https://access.redhat.com/security/cve/CVE-2026-4633"},{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2450247"},{"type":"PACKAGE","url":"https://github.com/keycloak/keycloak"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-10T03:50:40.968907299Z"}}