{"id":"CVE-2026-9689","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-9689","summary":"Keycloak Services has Improper Validation of Consistency within Input","details":"A flaw was found in Keycloak, an open-source identity and access management solution. When a client application is configured to accept broad redirect Uniform Resource Identifiers (URIs), a remote attacker can manipulate the authentication process by crafting a special web address. If a user clicks this link, the client application might incorrectly prioritize attacker-controlled information over legitimate data. This vulnerability, known as HTTP parameter pollution, could allow an attacker to bypass security measures or gain unauthorized access to resources.","published":"2026-05-27T12:31:24Z","modified":"2026-08-21T22:26:53.708948526Z","cvss":{"score":4.2,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N"},"epss":{"score":0.00322,"percentile":0.24856,"asOf":"2026-08-14"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.keycloak:keycloak-services","fixedVersion":null},{"ecosystem":"Maven","name":"org.keycloak:keycloak-services","fixedVersion":null}],"fix":{"url":"https://github.com/keycloak/keycloak/pull/49959","label":"keycloak/keycloak#49959"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-9689"},{"type":"WEB","url":"https://github.com/keycloak/keycloak/issues/49430"},{"type":"WEB","url":"https://github.com/keycloak/keycloak/pull/49959"},{"type":"WEB","url":"https://github.com/keycloak/keycloak/commit/18832bcae5bebd5a1d66c2ec5fcd640e576fa625"},{"type":"WEB","url":"https://github.com/keycloak/keycloak/commit/1f58a4b79a258bcf2ef86b58fbf0016cdb91291f"},{"type":"WEB","url":"https://github.com/keycloak/keycloak/commit/267a1a33d4dc1eac7622614ba9772b4e1e35726f"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:50846"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:50847"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:50848"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:50849"},{"type":"WEB","url":"https://access.redhat.com/security/cve/CVE-2026-9689"},{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2481845"},{"type":"PACKAGE","url":"https://github.com/keycloak/keycloak"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-21T22:26:53.708948526Z"}}