{"id":"CVE-2023-0264","aliases":[],"url":"https://o3.security/vulnerability/CVE-2023-0264","summary":"Keycloak vulnerable to user impersonation via stolen UUID code","details":"Keycloak's OpenID Connect user authentication was found to incorrectly authenticate requests. An authenticated attacker who could also obtain a certain piece of info from a user request, from a victim within the same realm, could use that data to impersonate the victim and generate new session tokens.","published":"2023-03-02T23:25:43Z","modified":"2026-09-10T03:49:52.897547035Z","cvss":{"score":8.7,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":2,"affectedPackages":[{"ecosystem":"Maven","name":"org.keycloak:keycloak-services","fixedVersion":"21.0.1"}],"fix":{"url":"https://github.com/keycloak/keycloak/commit/ec8109112e67208c13e13f6d1f8706a5a3ba8d4c","label":"keycloak/keycloak@ec81091"},"references":[{"type":"WEB","url":"https://github.com/keycloak/keycloak/security/advisories/GHSA-9g98-5mj6-f9mv"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-0264"},{"type":"WEB","url":"https://github.com/keycloak/keycloak/commit/ec8109112e67208c13e13f6d1f8706a5a3ba8d4c"},{"type":"WEB","url":"https://access.redhat.com/security/cve/CVE-2023-0264"},{"type":"PACKAGE","url":"https://github.com/keycloak/keycloak"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-10T03:49:52.897547035Z"}}