How to Find XSS Vulnerabilities: Practical Security Guide

This article explains Cross-Site Scripting (XSS) vulnerabilities, covering reflected, stored, blind, and DOM-based XSS; demonstrates common payloads and polyglots; contrasts manual versus automated discovery; describes tools and callback techniques for validation (e.g., Dalfox, XSStrike, xsshunter, Burp DOM Invader); and highlights special contexts where XSS can have escalated impact such as PDF generation and Electron apps (including potential server-side XSS and local RCE).