{"schema":"threatline.record/2","record":{"id":"CVE-2026-4633","aliases":["GHSA-rhgq-f8x5-j2jc"],"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.","categories":["Identity & access"],"product":"org.keycloak:keycloak-services","vendor":"Red Hat","ecosystem":"maven","affected_ranges":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-rhgq-f8x5-j2jc","source_modified_at":"2026-10-23T00:32:50Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"maven","name":"org.keycloak:keycloak-services"},"range":">= 26.5.0, < 26.6.1"},{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-rhgq-f8x5-j2jc","source_modified_at":"2026-10-23T00:32:50Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"maven","name":"org.keycloak:keycloak-services"},"range":"< 26.4.12"},{"source":"CVE 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List","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2450247","tags":["issue-tracking","x_refsource_REDHAT"]},{"url":"https://github.com/keycloak/keycloak/issues/47619","source":"GitHub Advisory Database"},{"url":"https://github.com/keycloak/keycloak/commit/b137016cc6dcfd9f59b2aa2e6d73af8b0ebf7c6e","source":"GitHub Advisory Database"},{"url":"https://github.com/keycloak/keycloak/commit/b4558a874fa79341404ae4d2d8f240f22bfed340","source":"GitHub Advisory Database"},{"url":"https://github.com/keycloak/keycloak/pull/47635","source":"GitHub Advisory Database"},{"source":"CVE List","url":"https://access.redhat.com/errata/RHSA-2026:19596","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://github.com/advisories/GHSA-rhgq-f8x5-j2jc","source":"GitHub Advisory 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