In OpenStack Heat, by launching a new Heat stack with a local URL an authenticated user may conduct network discovery revealing internal network configuration. Affected versions are <=5.0.3, >=6.0.0 <=6.1.0, and ==7.0.0.
https://bugs.launchpad.net/ossa/+bug/1606500
https://access.redhat.com/errata/RHSA-2017:1464
https://access.redhat.com/errata/RHSA-2017:1456