What Is PKCE and Why Does It Matter

PKCE (Proof Key for Code Exchange) is a security extension to OAuth 2.0 designed to prevent attackers from intercepting authorization codes and exchanging them for access tokens. It works by establishing a one-time cryptographic link between the authorization request and the token exchange, ensuring that only the application that initiated the login flow can complete it. Originally developed for mobile apps and single-page applications that cannot securely store a client secret, PKCE is now recommended for all OAuth clients, including confidential clients, to prevent authorization code injection attacks. With OAuth 2.1, PKCE becomes mandatory for all authorization code flows, making it a default security measure. Implementing PKCE involves generating a high-entropy code verifier, deriving a code challenge using the S256 method, and securely storing the verifier until the token exchange. PKCE provides additional security benefits by mitigating malicious app attacks and aligning with current security best practices, and platforms like Ory Hydra support its enforcement out of the box.

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