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XSS HOME

By · Reviewed & last updated · Part of XSS Tutorial

Welcome to the iwantcoding.com XSS Tutorial. Cross-site scripting is the most common, most-defeated web vulnerability of the last 20 years. This track teaches it from the defender’s seat: how it happens, why it’s dangerous, and the exact patches that stop it.

What this tutorial covers

ChapterYou will learn
XSSHow it works, reflected, stored, DOM-based, mutation, impact, a safe demo lab.
PreventionOutput encoding, context-aware escaping, sanitisation, framework auto-escape, DOMPurify, Trusted Types, CSP, HttpOnly / SameSite cookies.
Detection & HardeningCode review, lint rules, SAST, DAST, CSP reporting, WAF / RASP.
ExamplesCheatsheet, runnable snippets, quiz, exercises, bootcamp, certificate.

Who this is for

  • Frontend devs shipping anything with user-controlled HTML.
  • Reviewers auditing code for OWASP A03.
  • Security engineers writing CSP policies.
How to use this tutorial: read the chapter, run the example with Try it Yourself », do the exercise, then take the quiz at the bottom. Hit Mark complete when you're done — the sidebar will track your progress.

Example

Example
// XSS in one slide:
// VULNERABLE
results.innerHTML = 'You searched for: ' + query;
// SAFE
results.textContent = 'You searched for: ' + query;
Try it Yourself »

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