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XSS - How to verify cross site scripting in code

Posted on 2014-03-26
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Last Modified: 2014-04-01
This may be a really boneheaded question, but XSS doesn't exist in code unless input is taken in from the user and returned in the response without ever being validated, correct?  Meaning, if I take in input from the user, save it without validation, but never return it to the user, it is NOT XSS, correct?

Please set me straight!

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Question by:zrick1234
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Dave Baldwin earned 500 total points
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Nope.  Cross-site scripting (XSS) is where another site runs their scripts on your web page.  A common and normally acceptable version is tracking code for Google and other advertisers.  Unacceptable versions add code and even entire sections to your page with code that reports back to them.  It can includes forms that ask for usernames and passwords to 'phish' information from your users.

It has often been used in third-party advertisements to deliver viruses.  MySpace and Yahoo have both been used for that and probably Facebook too though I don't currently know of any examples.

http://en.wikipedia.org/wiki/Cross-site_scripting
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by:zrick1234
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Thank you
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