How can I pass data from an AuthorizeAttribute to the Controller?

I have created a custom AuthorizeAttribute which verifies some OAuth credentials that are sent inside the HTTP header. I am using some of these credentials to identify who is making the request. Once I parse this information in the AuthorizeAttribute is there any way to pass it over so that the data can be assigned to an instance variable of the Controller? Then anywhere in my Controller I will have the ID of the requesting party.