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What is XSS?

“Often people refer to Cross Site Scripting as CSS. There has been a lot of confusion
with Cascading Style Sheets (CSS) and cross site scripting. Some security people refer
to Cross Site Scripting as XSS. If you hear someone say “I found a XSS hole”, they are
talking about Cross Site Scripting for certain.” – “The Cross Site Scripting FAQ”

Also See ‘Cross Site Scripting’
What is Cross Site Scripting?