Cross Site Scripting (XSS) in ColdFusion
Firstly let me say that this is not definitive, this will not ensure that your site is safe. There may be more that you need to do. We were in need of a simple way to make sure that users were not using our "email a friend" forms to send nasty stuff around... So, using the stripHTML() udf from cflib we managed to get rid of all of the nasties from form fields as they hit the site just by looping over the form scope
<cfscript>
// clean up all the form fields for cross site scripting for(key in form)
{
form[key] = stripHTML(form[key]);
}
</cfscript>
if you wanted to be a little nicer and allow users to have HTML formating tags (like bold) in their forms, then you can use safeText() in a similar manner to get rid of nasty tags. This is a little slower to run however due to all the looping and stuff.// clean up all the form fields for cross site scripting for(key in form)
{
form[key] = stripHTML(form[key]);
}
</cfscript>
Of course, you really should do this for the URL scope and perhaps even the cookie scope.
How many times has everyone said to validate user input?
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