![Cracking JWTs: A Bug Bounty Hunting Guide [Part 7], The Final P1 Boss](https://miro.medium.com/v2/resize:fit:1108/1*cuBSTgyehMjyJG5oAZyv8A.png "Cracking JWTs: A Bug Bounty Hunting Guide [Part 7], The Final P1 Boss")
This article explains how JWT authentication can be bypassed through algorithm confusion without exposing private keys, highlighting common misconfigurations. It demonstrates a step-by-step exploit process using public key manipulation and math tricks to gain admin access. #JWT #AlgorithmConfusion
Keypoints
- JWTs rely on server-enforced verification of algorithms to prevent exploits.
- Algorithm confusion occurs when RS256 is wrongly accepted as HS256, leading to security bypass.
- Attackers can forge JWTs and hijack admin privileges without private keys.
- The process involves manipulating JWT headers, extracting public keys, and crafting signed tokens.
- Proper server-side validation and trust restrictions on algorithms are essential for JWT security.