An authorization-check flaw was discovered in federation configurations of the OpenStack Identity service (keystone). An authenticated federated user could request permissions to a project and unintentionally be granted all related roles including administrative roles.
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2673
https://bugs.launchpad.net/keystone/+bug/1677723
https://access.redhat.com/errata/RHSA-2017:1597
https://access.redhat.com/errata/RHSA-2017:1461