TYPO3 Core

Concerning data handling and persistence, basically only the backend context is considered (in DataHandler, PageLayoutView et al). General permission handling in Extbase and other frontend related implementation is only implemented on the visibility of pages and frontend user groups.

In order to overcome these differences. Permission handling has to be generalized and used in affected components.
For instance as an impact, DataHandler does not rely on a BackendUserAuthentication (BE_USER) instance anymore, but on a generic Permission definition that can be used in backend and frontend context.