Authority of the subscriber to approve access to its data is the greatest concern for an information security manager if omitted from the contract, as it may expose the subscriber's data to unauthorized or inappropriate access by the vendor or third parties. The subscriber should have the right to control who can access its data, for what purposes, and under what conditions. The contract should also specify the vendor's obligations to protect the confidentiality, integrity, and availability of the subscriber's data, and to notify the subscriber of any breaches or incidents.
Reference = CISM Review Manual, 27th Edition, Chapter 4, Section 4.2.1, page 2201; Drafting and Negotiating Effective Cloud Computing Agreements2; CISM Online Review Course, Module 4, Lesson 2, Topic 13