JWT Security: What Developers Get Wrong (And How to Test It)
The most common JWT security mistakes, how to spot them, and how to test your implementation without sending tokens to third-party tools.
Published:
Tags: security, jwt, authentication
JWT Security: What Developers Get Wrong (And How to Test It) The most common JWT security mistakes, how to spot them, and how to test your implementation without sending tokens to third-party tools. Mistake 1: Trusting the algorithm header The JWT header specifies which algorithm was used to sign the token. Early JWT libraries trusted this header implicitly - an attacker could set to bypass signature verification entirely, or switch from RS256 to HS256 to exploit a public key as an HMAC secret. Always hardcode the expected algorithm in your server-side verification code. Never accept the algorithm from the token itself. Mistake 2: Not validating expiry and audience A JWT with a valid signature is not necessarily valid for your use case. Always validate (token has not expired), (token was…
All articles · theproductguy.in