Enterprise Defenses Recovered at the Edge and Collapsed Inside

Summary: Picus Labs' Blue Report 2026, drawing on more than 338 million attack simulations in client production environments in the first half of 2026, found average prevention effectiveness rose from 62% to 69% and logging hit a four-year high of 58%. Once an attacker is inside as an authenticated user, the Post-Compromise Prevention Rate was 37%, with reconnaissance stopped only 10% of the time, credential reads from the registry blocked in under 1% of attempts, and alerts fired on just 14% of simulated attacks.
Bottom line: Defenses stop roughly two attacks in three at the perimeter but barely one in three inside, and the quiet steps that precede a breach - domain mapping, session harvesting, credential theft - run almost unopposed while fewer than one in seven attacks produces an alert for anyone to act on.

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