openid / openid/connect

FedCM Binding of OIDC?

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component: Core migrated-from-bitbucket priority: major type: task
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Description

Originally submitted by Nat (Nat Sakimura) on 2025-05-23

As I understand, FedCM could be another binding for OpenID Connect.

Account Endpoint looks quite similar to UserInfo Endpoint.

ID assertion endpoint looks quite similar to Token Endpoint.

Of course, there are a bunch of differences but there are similarities as well. For example, scope can also be sent, fields is used instead of claims, token that is returned could be ID Token. etc. There is no client credentials either.

Has any of you contemplated on it?

Google apparently migrated much of Sign in with Google to FedCM and Firefox is also implementing it.


Bitbucket status: new

Bitbucket origin: issue 2179

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Research direction

No files, tests, or entry points are identified. Start by reviewing the stated similarities between FedCM and OpenID Connect, including the Account, UserInfo, ID assertion, and Token endpoints. Done would require an agreed scope and design for whether and how FedCM should bind to OIDC.

Written by the indexing model from the issue text.

Assessment

Domain
authentication
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
25/100

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