Luggage_isu 3.5.6-5.6 has been released (along with its upstream, Luggage 3.5.6).
Updates the CKEditor Library to version 4.9.2 to address https://www.drupal.org/sa-core-2018-003 and https://ckeditor.com/blog/CKEditor-4.9.2-with-a-security-patch-released/
When updating sites, be sure to update the git submodule:
git submodule update sites/all/libraries/ckeditor/
The release is available on Github at https://github.com/isubit/luggage_isu/releases/tag/5.6