TYPO3 Core

In TYPO3 12.1.0 a frontend plugin tries to set a flashMessage. This leads to the error:

PHP Warning: Undefined array key "cookieDomain" in .../vendor/typo3/cms-core/Classes/Authentication/AbstractUserAuthentication.php line 350

A cookieDomain is not set in my environment. I'm not sure if this is required in TYPO3 12 now or if this should also work without this configuration.

For the moment I think of a bug when I follow the code in AbstractUserAuthentication

So I just fixed in the file like:

$cookieDomain = $GLOBALS['TYPO3_CONF_VARS']['SYS']['cookieDomain'] ?? '';