XSS Attack Guide 2026: Cross-Site Scripting Detection, Exploitation & Bypass
Cross-site scripting has been broken for as long as the web has existed. In 2026, it still shows up everywhere — modern SPAs, legacy enterprise apps, AI-generated frontends with no output encoding, CMS platforms with half-baked sanitization. XSS is the kind of vulnerability that’s “easy” to dismiss until you see a session token extracted from a banking app or a phishing payload delivered from a trusted domain. This guide covers everything: how XSS works, the three main categories, detection with Burp and manual techniques, exploitation for real impact, filter bypass when WAFs and sanitizers are in the way, and DOM-based XSS which most people still get wrong. ...