---
title: "Breaking: #71521 - Property userAuthentication removed from CommandController"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:breaking-71521"
source: "Changelog/8.0/Breaking-71521-PropertyUserAuthenticationRemovedFromCommandController.rst"
typo3-version: "8.0"
typo3-major: 8
type: "breaking"
issue: 71521
forge: "https://forge.typo3.org/issues/71521"
tags: ["PHP-API", "ext:extbase"]
rendered: "2026-09-17T12:41:04+00:00"
---

# Breaking: #71521 - Property userAuthentication removed from CommandController {#breaking-71521-property-userauthentication-removed-from-commandcontroller}

See [forge#71521](https://forge.typo3.org/issues/71521)

## Description {#description}

The property `$userAuthentication` was removed from the Extbase `CommandController` class and
has been migrated to the newly introduced `getBackendUserAuthentication()` method.

## Impact {#impact}

All command controllers deriving from `CommandController` with see a fatal error when accessing
properties or methods of the removed `$userAuthentication` property.

## Migration {#migration}

Use the newly introduced `getBackendUserAuthentication()` method.