A processing device in an illustrative embodiment includes a processor coupled to a memory and is configured to receive user credentials from a user device in conjunction with an access request, to apply one or more automated tests in order to determine one or more device identifiers of the user device, to generate a risk score for the access request based at least in part on the received user credentials and the one or more determined device identifiers, and to grant or deny the access request based at least in part on the risk score.