RFC 9470

OAuth 2.0 Step Up Authentication Challenge Protocol, September 2023

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V. Bertocci
B. Campbell
oauth (sec)

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DOI:  https://doi.org/10.17487/RFC9470

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It is not uncommon for resource servers to require different authentication strengths or recentness according to the characteristics of a request. This document introduces a mechanism that resource servers can use to signal to a client that the authentication event associated with the access token of the current request does not meet its authentication requirements and, further, how to meet them. This document also codifies a mechanism for a client to request that an authorization server achieve a specific authentication strength or recentness when processing an authorization request.

For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 8729.

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