Included in this release is a security patch to the Drupal module Ctools. There are also several other contributor modules updates in his release as we look to migrate the site to Drupal 9 in the coming months.
Drupal core uses the third-party CKEditor library. This library has an error
in parsing HTML that could lead to an XSS attack. CKEditor 4.16.1 and later
include the fix.