XSS usually consists of injecting JavaScript and HTML into an application, though, right? If we clean our content properly, I just don't really see much of a threat from it. The way I learned scripting, anytime anywhere that you allow a user to input content, you make sure that the content can't harm your application. And with vBulletin datamanagers, pretty much everything is cleaned unless you specify it NOT to be, right? Not to mention you can choose the type of verification needed, or even make your own verification functions for the datamanagers.
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