Detection Gap
Noun · Security & Infosec
Definitions
A meaningful area of attacker behavior, system activity, or evidence collection that current monitoring cannot observe or alert on. Detection gaps are often found during purple-team exercises, incident reviews, or architecture changes.
In plain English: An important kind of malicious activity that current security monitoring does not catch.
Example: "The exercise exposed a detection gap around OAuth token abuse because no one was collecting the right audit events."