For years, the specter of viruses, Trojan horses and worms caused many a chief security officer to lose sleep. But it’s the enemy within that is now prompting IT staffers to ramp up security efforts. According to Forrester Research, the majority of security breaches involve internal employees, with some estimates as high as 85 percent.

Inadvertent employee error, laptop theft, contractors’ unauthorized access to information, disgruntled employees, password mismanagement – all of these factors can mean drastic revenue loss, legal liabilities, diminished productivity and brand erosion.

What are the top internal security threats – and how can you avoid them? Read on to find out.