HACKR.GG
00 — Overview

JWT Attacks

JSON Web Tokens are everywhere — and frequently misconfigured. Learn the full attack surface: weak secrets, the none algorithm, algorithm confusion, and key injection.

Intermediate·40 min·7 tasks
// By the end of this module
Decode and understand the structure of a JSON Web Token
Exploit the "none" algorithm bypass to forge unsigned tokens
Perform algorithm confusion attacks (RS256 → HS256)
Extract secrets from weak HS256 keys with offline cracking