Security management techniques for service authorization for communication systems are provided. In one or more methods, a first element or function in a home network of a communication system registers a second element or function in the home network as a service consumer of one or more services provided by at least a third element or function in the home network, receives a request from the second element or function, and provides an access token to the second element or function responsive to authenticating the second element or function, the access token being used by the second element or function to access the one or more services provided by the third element or function.