With the fault lines in the battle against cyberattacks pushed back, 2016’s cyberthreat landscape is becoming defined by accidental in-house security lapses and sophisticated efforts to exploit employees’ weaknesses, according to the 2016 Global Threat Report by Forcepoint.

While a company’s defense perimeter is always being tested, the threats within its walls are the ones that usually cause the most damage. The report cites a January 2016 Forrester survey, which found that internal incidents were a “leading cause” of the breaches experienced by respondent firms, with more than half noting that they were due to employee negligence or oversights.