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I am tempted to let my OpenID Connect/Oauth2 OP to accept CORS request on an oauth2 endpoint after checking that client id and its allowed origin match.

This way a RP would be able to get a response directly without using redirect_uri or a postmessage relay or a web storage relay madness.

Any foreseen issues?

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    How would that work? I mean how would you protect the "secret"? – themihai Apr 26 '16 at 15:27
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    You have not provided enough information for anyone to give you an accurate answer. The only advice i can give you is to read the OAuth RFCs. – rook Dec 24 '16 at 20:13
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If you are restricting the output of CORS headers for trusted client IDs and origin combinations only then this should not open up your site to any CSRF attack vectors.

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