continuwuity/changelog.d/2110.bugfix.md
Michel-Marie MAUDET f0493a7ba8 fix(oauth): Use unauthorized_client for unregistered grant types
The token endpoint already refused grant types the client had not
registered, but reported it as `invalid_grant`. RFC 6749 section 5.2
reserves `invalid_grant` for an authorization grant which is "invalid,
expired, revoked, does not match the redirection URI used in the
authorization request, or was issued to another client", and defines
`unauthorized_client` for a client which "is not authorized to use this
authorization grant type".

Report the condition with the error code the specification assigns to it,
matching the device authorization endpoint.
2026-08-07 08:52:20 +00:00

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Markdown

The OAuth 2.0 device authorization endpoint now rejects clients which did not register the device code grant type, instead of issuing them a device code. The token endpoint now returns the `unauthorized_client` error code when a client requests a grant type it did not register, instead of `invalid_grant`. Contributed by @mmaudet.