The Web Authorization (OAuth) protocol allows a user to grant a third-party web site or application access to the user's protected resources, without necessarily revealing their long-term credentials, or even their identity. For example, a photo-sharing site that supports OAuth could allow its users to use a third-party printing web site to print their private pictures, without allowing the printing site to gain full control of the user's account and without having the user share his or her photo-sharing sites' long-term credential with the printing site. The OAuth 2.0 protocol suite already includes * a procedure for enabling a client to register with an authorization server, * a protocol for obtaining authorization tokens from an authorization server with the resource owner's consent, and * protocols for presenting these authorization tokens to protected resources for access to a resource. This protocol suite has been enhanced with functionality for interworking with legacy identity infrastructure (such as SAML), token revocation, token exchange, dynamic client registration, token introspection, a standardized token format with the JSON Web Token, and specifications that mitigate security attacks, such as Proof Key for Code Exchange. The ongoing standardization efforts within the OAuth working group focus on increasing interoperability of OAuth deployments and to improve security. More specifically, the working group is defining proof of possession tokens, developing a discovery mechanism, providing guidance for the use of OAuth with native apps, re-introducing the device flow used by devices with limited user interfaces, additional security enhancements for clients communicating with multiple service providers, definition of claims used with JSON Web Tokens, techniques to mitigate open redirector attacks, as well as guidance on encoding state information. For feedback and discussion about our specifications please subscribe to our public mailing list at . For security related bug reports that relate to our specifications please contact . If the reported bug report turns out to be implementation-specific we will attempt to forward it to the appropriate developers.