GZ Scripts Car Rental Script cross site scripting

A vulnerability classified as problematic has been found in GZ Scripts Car Rental Script 1.8. Affected is an unknown function of the file /EventBookingCalendar/load.php?controller=GzFront/action=checkout/cid=1/layout=calendar/show_header=T/local=3. The manipulation of the argument first_name/second_name/phone/address_1/country leads to cross site scripting. It is possible to launch the attack remotely. The identifier of this vulnerability is VDB-234432. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.