Starbucks: XSS on https://www.starbucks.co.uk (can lead to credit card theft) (/shop/paymentmethod)

Hi, Steps to reproduce: 0. Run Firefox these steps require Firefox. 1. Log in on https://www.starbucks.co.uk/account/signin 2. Go to https://www.starbucks.co.uk/shop/card/egift and add any card to your basket. 3. Go to...