This video focuses on a common Bug Bounty and Capture The Flag question. Ok, you found an XSS – that's great, but so what? What's the impact?

XSS (Cross Site Scripting) vulnerabilities of all types are everywhere. During a typical penetration test, the gold standard XSS proof of concept is the fabled “alert(1)” dialogue pop-up box.

For somebody who technically understands what an XSS really means, the impact of this alert box is clear – an attacker can do just about anything they like in JavaScript to the affected user.

But what does “anything they like” in this XSS context actually mean?

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