JWTs are vital for authentication but can become security risks if misconfigured. This article explains common JWT vulnerabilities and how pentesters exploit them, emphasizing the importance of proper configuration and validation. #JWT #TokenForgery
Keypoints
- JWTs are composed of a header, payload, and signature used for secure authentication.
- Misconfigurations like the “alg”: “none” vulnerability allow token forgery and privilege escalation.
- Weak secrets in HMAC algorithms can be brute-forced to forge valid tokens.
- Inconsistent algorithm enforcement enables attacks such as algorithm confusion between RS256 and HS256.
- Proper validation and mitigation strategies are essential to prevent JWT exploitation.