Red Hat Keycloak before version 2.4.0 did not correctly check permissions when handling service account user deletion requests sent to the rest server. An attacker with service account authentication could use this flaw to bypass normal permissions and delete users in a separate realm.
rhn.redhat.com/errata/RHSA-2017-0876.html
www.securityfocus.com/bid/97392
www.securitytracker.com/id/1038180
access.redhat.com/errata/RHSA-2017:0872
access.redhat.com/errata/RHSA-2017:0873
bugzilla.redhat.com/show_bug.cgi?id=1388988
github.com/advisories/GHSA-778x-2mqv-w6xw
nvd.nist.gov/vuln/detail/CVE-2016-8629