{"id":"BIT-keycloak-2026-7507","summary":"Org.keycloak/keycloak-services: session fixation in oidc login flow that can lead to account takeover","details":"A session fixation vulnerability was found in Keycloak's login-actions endpoints. An unauthenticated attacker could exploit this flaw by pre-creating an authentication session and tricking a victim into visiting a maliciously crafted link. By leveraging the /login-actions/restart endpoint—which processes session handles without adequate CSRF protection or cookie ownership validation—an attacker can reset the authentication flow state. This causes Single Sign-On (SSO) to authenticate the victim transparently upon clicking the link, allowing the attacker to hijack the required-action form without needing the victim's credentials. A successful exploit could lead to complete account takeover, including highly privileged administrative accounts.","aliases":["CVE-2026-7507","GHSA-hf67-5vvq-fm3r"],"modified":"2026-09-08T08:48:06.917247360Z","published":"2026-08-25T11:42:36.076Z","database_specific":{"cpes":["cpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:*","cpe:2.3:a:keycloak:keycloak:*:*:*:*:*:*:*:*"],"severity":"High"},"references":[{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:19594"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:19595"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:19596"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:19597"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-7507"},{"type":"ADVISORY","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2464145"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-7507"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-7507.json"}],"affected":[{"package":{"name":"keycloak","ecosystem":"Bitnami","purl":"pkg:bitnami/keycloak"},"ranges":[{"type":"SEMVER","events":[{"introduced":"26.4.0"},{"fixed":"26.4.12"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/keycloak/BIT-keycloak-2026-7507.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"}]}],"schema_version":"1.9.0"}