OAuth 2.0 Authorization Server Issuer Identification

RFC 9207

Abstract

This document specifies a new parameter called iss. This parameter is used to explicitly include the issuer identifier of the authorization server in the authorization response of an OAuth authorization flow. The iss parameter serves as an effective countermeasure to "mix-up attacks".

Document Information

• RFC Number: 9207
• Category: Standards Track
• Published: March 2022
• Authors:
  • Karsten Meyer zu Selhausen (Hackmanit)
  • Daniel Fett (yes.com)

Table of Contents

1. Introduction
2. Response Parameter iss
3. Authorization Server Metadata
4. Security Considerations
5. IANA Considerations
6. References

• Acknowledgements
• Authors' Addresses