Breaking: #82377 - Option to allow uploading system extensions removed¶
The option to allow uploading additional extensions as system extensions in TYPO3 has been removed without substitution.
Disclaimer: It is highly discouraged by the TYPO3 Core to modify anything within
especially adding extensions, as typo3conf/ is the folder to add or override extensions.
If an administrator needs to do changes within
typo3/sysext/ it's at his/her own risk,
and should not be encouraged to be possible from TYPO3 itself.
The possibility to upload an extension into
typo3/sysext/ via the Extension Manager / TYPO3 Backend
interface is removed. System extensions can only be added or modified via the file system now.
TYPO3 instances having the option
$GLOBALS['TYPO3_CONF_VARS']['EXT']['allowSystemInstall'] enabled and do not
run in TYPO3's Composer Mode.
As this option was disabled by default for over 10 years, it is highly unlikely this change will affect a regular instance.
The mentioned option, if set, is automatically removed when accessing the Install Tool through