In versions of Drupal 8 core prior to 8.3.7; There is a vulnerability in the entity access system that could allow unwanted access to view, create, update, or delete entities. This only affects entities that do not use or do not have UUIDs, and entities that have different access restrictions on different revisions of the same entity.

In versions of Drupal 8 core prior to 8.3.7; There is a vulnerability ...

Drupal Entity access bypass for entities that do not have UUIDs or have protected revisions