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  • UMA Implementer's Guide

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When a client redirects a requesting party to an authorization server for claims gathering, there is the potential for cross-site crosssite request forgery (CSRF) through an open redirect if the authorization server did not force the client to pre-register its redirection endpoint, as well as server-side artifact tampering. Using the state parameter to send the ticket value (ideally encrypted) enables the client to check that the ticket parameter ultimately returned by the authorization server has not been maliciously changed, for example by a man in the browser (MITB), once the value is returned. Encrypting the value also has the benefit of enabling the client not to have to keep state during the interaction period when it checks the returned value.

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