A flaw was found in Keycloak. This issue occurs due to improperly enforcing token types when validating signatures locally. This could allow an authenticated attacker to exchange a logout token for an access token and possibly gain access to data outside of enforced permissions.
https://bugzilla.redhat.com/show_bug.cgi?id=2166728
https://access.redhat.com/security/cve/CVE-2023-0657