Cross-Site Scripting Advanced

Cross-Site Scripting (XSS) is injecting malicious JavaScript code into a web application, then executing it in victim browsers. Example: a comment form accepts user input. An attacker submits . If the app renders the comment without escaping, the script executes in other users' browsers, stealing their session cookies. Advanced XSS covers: stored XSS (payload saved permanently), reflected XSS (payload in URL), DOM-based XSS (vulnerability in browser JavaScript), context-aware escaping, CSP evasion, and exploitation.