Cognito OAuth access token missing "typ" header parameter

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The access tokens supplied by Cognito are missing the "typ" header parameter which breaks with the RFC 9068 OAuth2.0 JWT spec. It states that:

"JWT access tokens MUST include this media type in the "typ" header parameter to explicitly declare that the JWT represents an access token complying with this profile."

Jon
asked 3 months ago161 views
1 Answer
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RFC 9068 was published in October 2021 with these snippets in the Introduction setting the stage for standardization.

The original OAuth 2.0 Authorization Framework [RFC6749] specification does not mandate any specific format for access tokens. [...] This specification aims to provide a standardized and interoperable profile as an alternative to the proprietary JWT access token layouts going forward.

If you need to determine if a token is an access token, Amazon Cognito issued JWTs include a token_use claim as part of the payload with the value access or id (see Using the access token ).

profile pictureAWS
answered 3 months ago
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EXPERT
reviewed 3 months ago
  • Is there a plan for Cognito to adhere to the JWT spec or will it continue with it's proprietary implementation? It is currently incompatible with tooling that adheres to RFC9068

  • Jon - please contact your AWS account team about Cognito feature roadmap. Share this link and let them know to contact me for additional background.

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