The principle of least privilege-ensuring access is granted only to those whose job functions require it-is the primary control for securing data, especially in cloud environments.
"Access to information and systems should be based on the principles of least privilege and need to know, regardless of environment."
- CISM Review Manual 15th Edition, Chapter 3: Information Security Program Development and Management, Section: Access Control Management ISACA's CISM practice questions consistently highlight this principle as central to effective cloud security.