An attacker performs reconnaissance on a Chief Executive Officer (CEO) using publicity available resources to...

An attacker performs reconnaissance on a Chief Executive Officer (CEO) using publicity available resources to gain access to the CEO’s office. The attacker was in the CEO’s office for less than five minutes, and the attack left no traces in any logs, nor was there any readily identifiable cause for the exploit. The attacker in then able to use numerous credentials belonging to the CEO to conduct a variety of further attacks. Which of the following types of exploit is described?