On the Laravel News site they’ve posted an announcement recommending all Laravel 5.6.x and 5.5.x users upgrade to the latest release (5.6.30 & 5.5.42) due to a security issue dealing with the value. Laravel 5.6.30 and Laravel 5.5.42 have both been released to fix a security issue and is recommended that all users upgrade as soon as possible.
Read full news article on PHPDeveloper.org