In Drupal 8.x prior to 8.3.7 When creating a view, you can optionally use Ajax to update the displayed data via filter parameters. The views subsystem/module did not restrict access to the Ajax endpoint to only views configured to use Ajax. This is mitigated if you have access restrictions on the view. It is best practice to always include some form of access restrictions on all views, even if you are using another module to display them.
www.securityfocus.com/bid/100368
www.securitytracker.com/id/1039200
github.com/FriendsOfPHP/security-advisories/blob/master/drupal/core/CVE-2017-6923.yaml
github.com/FriendsOfPHP/security-advisories/blob/master/drupal/drupal/CVE-2017-6923.yaml
nvd.nist.gov/vuln/detail/CVE-2017-6923
www.drupal.org/forum/newsletters/security-advisories-for-drupal-core/2017-08-16/drupal-core-multiple
www.drupal.org/SA-CORE-2017-004