The latest US Department of Defense ‘Red Disk’ data security leak is yet another indicator of how current cybersecurity thinking is entirely out of sync with the broader changes in IT that have taken place over the last 20 years. The explosion of IT systems, networks, users, clouds, and devices has caused the size of the typical enterprise’s attack surface to expand exponentially. Any user or device can be the weakest link and become the steppingstone to a major data breach.