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ISACA Certified Information Security Manager (CISM) 2026 exam content outline · Domain 4: Incident management

Incident classification, categorization and severity

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Last reviewed September 30, 2026 · Leer en español

Not every event is an incident, and not every incident is equally serious. Classification sorts what the organization detects so that each case gets the right level of attention, the right team and the right speed of response. Without it, teams either treat everything as a crisis and burn out, or treat serious incidents as routine and respond too slowly. Classification is defined in the incident response plan before anything happens, so responders are applying agreed criteria rather than improvising.

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