Chapter 7 of 10 · Web Security Basics 70%

🛂 A CORS misconfiguration in a major Bitcoin exchange let researchers drain any user's wallet from a malicious webpage

The same-origin policy is the browser's main security wall. You'll learn what it blocks, where CORS punches holes through it, and why misconfigured access headers are a bug bounty favorite. 🧱

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Web Security Basics

🛂 A CORS misconfiguration in a major Bitcoin exchange let researchers drain any user's wallet from a malicious webpage

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HTTP requests and responses

URLs, domains, and DNS

HTML and the browser

Cookies and sessions

Authentication mechanisms

HTTPS and TLS

Same-origin policy and CORS

HTTP security headers

Common web vulnerabilities

Browser DevTools for recon