---
title: "Breaking: #87627 - Remove Property extensionName of AbstractController"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:breaking-87627"
source: "Changelog/10.0/Breaking-87627-RemovePropertyExtensionNameOfAbstractController.rst"
typo3-version: "10.0"
typo3-major: 10
type: "breaking"
issue: 87627
forge: "https://forge.typo3.org/issues/87627"
tags: ["PHP-API", "NotScanned", "ext:extbase"]
rendered: "2026-09-18T10:44:28+00:00"
---

# Breaking: #87627 - Remove Property extensionName of AbstractController {#breaking-87627}

See [forge#87627](https://forge.typo3.org/issues/87627)

## Description {#description}

`\TYPO3\CMS\Extbase\Mvc\Controller\AbstractController::$extensionName`
has been removed and is no longer available in subclasses of
`\TYPO3\CMS\Extbase\Mvc\Controller\AbstractController`, i.e.
`\TYPO3\CMS\Extbase\Mvc\Controller\ActionController` and their derivates.

## Impact {#impact}

Accessing the missing property `$extensionName` will throw a fatal error.

## Affected Installations {#affected-installations}

All installations that read from `\TYPO3\CMS\Extbase\Mvc\Controller\AbstractController::$extensionName`.

## Migration {#migration}

The extension name is set in and available through the request object that is available in the controller.
See `\TYPO3\CMS\Extbase\Mvc\Controller\AbstractController::$request` and `\TYPO3\CMS\Extbase\Mvc\Request::getControllerExtensionName()`
for more information.