Breaking: #98179 - Remove backend interface selector and configurable redirect

See forge#98179


Previous TYPO3 installations allowed to configure an interface selector in the backend login that gave the authenticating backend user the possibility to choose whether to get redirected to frontend or backend by configuring $GLOBALS['TYPO3_CONF_VARS']['BE']['interfaces'] = 'backend,frontend'.

If only one option was configured, the redirect to either backend or frontend was enforced, where backend was the default configuration.

This feature was meaningful once TYPO3 shipped EXT:feedit, but was conceptually broken ever since, as the matter of fact a TYPO3 installation can contain multiple site roots was overseen and a user may get redirected to the wrong frontend. Also, if EXT:adminpanel is not installed, there is no one-click solution to access the TYPO3 backend.


The configuration option $GLOBALS['TYPO3_CONF_VARS']['BE']['interfaces'] is removed, therefore an authenticated user always gets redirected to the backend.

Affected installations

All TYPO3 installations relying on this feature are affected.


The extension scanner will find remaining usages of $GLOBALS['TYPO3_CONF_VARS']['BE']['interfaces'], which can be removed.

If a TYPO3 project really relies on this feature, create an XCLASS of \TYPO3\CMS\Backend\Controller\LoginController, where also a custom Fluid template may be used.