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This flaw allows a remote user authenticated with a password to register a false second authentication factor along with an existing one and bypass authentication.","status":"published","published":"2024-04-25T12:20:11.606Z","modified":"2025-11-11T15:57:27.827Z","cvss":[{"version":"3.1","score":5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:35:24.360381Z"}],"euvd":[{"id":"EUVD-2024-1090","description":"A flaw was found in Keycloak, where it does not correctly validate its client step-up authentication in org.keycloak.authentication. This flaw allows a remote user authenticated with a password to register a false second authentication factor along with an existing one and bypass authentication.","status":"published","published":"2024-04-25T12:20:11Z","modified":"2025-11-11T15:57:27Z","cvss":[{"version":"3.1","score":5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-02T19:49:18.896005Z"}],"ghsa":[{"id":"GHSA-4f53-xh3v-g8x4","title":"Keycloak secondary factor bypass in step-up authentication","description":"Keycloak does not correctly validate its client step-up authentication. A password-authed attacker could use this flaw to register a false second auth factor, alongside the existing one, to a targeted account. The second factor then permits step-up authentication.","status":"published","published":"2024-04-17T17:31:50Z","modified":"2024-08-07T12:31:28Z","cvss":[{"version":"3.1","score":5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"cwes":["CWE-287","CWE-288"],"updated_at":"2026-11-02T14:37:58.427757Z"}],"nvd":[{"id":"CVE-2023-3597","description":"A flaw was found in Keycloak, where it does not correctly validate its client step-up authentication in org.keycloak.authentication. This flaw allows a remote user authenticated with a password to register a false second authentication factor along with an existing one and bypass authentication.","status":"published","published":"2024-04-25T13:15:50.523Z","modified":"2026-06-17T06:14:26.01Z","cvss":[{"version":"3.1","score":5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"secondary"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:09:11.362739Z"}],"osv":[{"id":"GHSA-4f53-xh3v-g8x4","title":"Keycloak secondary factor bypass in step-up authentication","description":"Keycloak does not correctly validate its client step-up authentication. A password-authed attacker could use this flaw to register a false second auth factor, alongside the existing one, to a targeted account. The second factor then permits step-up authentication.","status":"published","published":"2024-04-17T17:31:50Z","modified":"2026-09-10T03:50:11.17667205Z","cvss":[{"version":"3.1","score":5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"cwes":["CWE-287","CWE-288"],"updated_at":"2026-11-02T15:46:36.782754Z"}]}}