OAuth 2.0 Authorization Server Issuer Identifier in Authorization Response

Document Type Replaced Internet-Draft (individual)
Authors Karsten zu Selhausen  , Daniel Fett 
Last updated 2020-11-17
Replaced by draft-ietf-oauth-iss-auth-resp
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Intended RFC status (None)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


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


Karsten zu Selhausen (karsten.meyerzuselhausen@hackmanit.de)
Daniel Fett (mail@danielfett.de)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)