DIAMOND Bypassing "Proof of Possession" (DPoP) in OAuth 2.1

[TheMekanic]

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As of 2026, high-security sites like Wise and Revolut use DPoP to bind access tokens to a specific device's private key.
Implementation Steps:

1. Key Generation: Generate a local RSA or EC key pair within your config.
   
2. The DPoP Header: Create a JWT header containing
   htu
   (target URL) and
   htm
   (HTTP method).
   
3. Cryptographic Signing: Sign the JWT using your private key and include the public key in the JWT
   jwk
   header.
   
4. Injection: Pass this JWT in the
   DPoP
   header of your API request. The server will reject any hit where the token doesn't match the signature.