MailOrderWorks contains a flaw that allows a persistent cross-site scripting (XSS) attack. This flaw exists because the application does not validate the 'firstname', 'lastname', 'custom A1' and 'custom A2' fields upon submission to dispatch order. This may allow an attacker to create a specially crafted request that would execute arbitrary script code in a user's browser within the trust relationship between their browser and the server.