{"id":"BIT-keycloak-2026-18215","summary":"Keycloak-services: keycloak-services: microsoft external access-token exchange bypasses configured tenant","details":"Keycloak provides a way to let users log in using Microsoft accounts while restricting access to a specific organization (tenant). A flaw was discovered where this restriction is ignored when using the token exchange feature. This means an attacker with a valid Microsoft token from a completely different organization could gain access to the Keycloak realm, potentially accessing sensitive data or performing unauthorized actions.","aliases":["CVE-2026-18215"],"modified":"2026-09-17T14:45:09.416534802Z","published":"2026-08-31T14:37:15.829Z","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/security/cve/CVE-2026-18215"},{"type":"ADVISORY","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2508309"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-18215"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:68277"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:68278"}],"affected":[{"package":{"name":"keycloak","ecosystem":"Bitnami","purl":"pkg:bitnami/keycloak"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"26.7.3"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/keycloak/BIT-keycloak-2026-18215.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"}]}],"schema_version":"1.9.0"}