JWT none algorithm supported - PortSwigger In addition to cryptographically strong algorithms, the JWT specification also defines the "none" algorithm, which can be used with "unsecured" (unsigned) JWTs When this algorithm is supported on the server, it may accept tokens that have no signature at all
JWT None Algorithm – VulnAPI Documentation - CerberAuth Accepting the "none" algorithm in a JSON Web Token (JWT) occurs when a JWT is signed with the "none" algorithm, it means there is no signature, making it easy for attackers to tamper with the token's content without detection
jwt: Why is signature algorithm not needed when verifying a . . . Heads up that you should be very careful to only allow the algorithms that you expect when decoding Otherwise you might accept a token that was signed with alg=none , essentially bypassing any verification
Hacking JWT : Exploiting the “none” algorithm | by sourav . . . Some libraries treated None algorithms as valid token with a verified signature As a result anyone can create their own “signed” tokens and can use whatever claims they want in the payload This
Critical vulnerabilities in JSON Web Token libraries - Auth0 Meet the "None" Algorithm The none algorithm is a curious addition to JWT It is intended to be used for situations where the integrity of the token has already been verified Interestingly enough, it is one of only two algorithms that are mandatory to implement (the other being HS256)