python-pyjwt: PyJWT: Authentication bypass due to forged JSON Web Tokens

A flaw was found in PyJWT, a Python library for JSON Web Token JWT implementation. When decoding JWTs, the library fails to validate the use of JSON Web Keys JWK in the HMAC algorithm while also supporting asymmetric algorithms. This allows a remote attacker to use the issuer's public key as the...

JSON Web Token (JWT) Weaknesses

JSON Web Tokens, or JWTs, are an encoded set of claims commonly seen in REST APIs and Single page web applications SPAs. These encoded claims are used to provide identification of the requester and other information related to accessing. It is a stateless mechanism, and the token is sent with eve...

Key confusion through non-blocklisted public key formats

Impact What kind of vulnerability is it? Who is impacted? Disclosed by Aapo Oksman Senior Security Specialist, Nixu Corporation. PyJWT supports multiple different JWT signing algorithms. With JWT, an attacker submitting the JWT token can choose the used signing algorithm. The PyJWT library requir...

Critical Vulnerabilities Affecting JSON Web Token Libraries

Critical vulnerabilities exist in several JSON Web Token JWT libraries – namely the JavaScript and PHP versions – that could let an attacker bypass the verification step. Tim McLean, a Canadian security researcher who specializes in cryptography and dug up the issues, points out that attackers...