Incident Classification and Categorization is the systematic process of assigning security incidents to defined taxonomy dimensions — incident type, severity level, business impact category, and source — to enable consistent prioritization, appropriate resource allocation, and compliant regulatory response. It is a governance control, not merely an operational triage step: the classification taxonomy itself (who owns it, how it is structured, how it is maintained) is the primary CISM-level deliverable. Classification occurs at multiple points in the incident lifecycle — at initial report, after triage, and after investigation — and is updated as evidence changes.
Where it stops · what it isn't
- —IS: A structured governance process for assigning multi-dimensional labels to confirmed or suspected security incidents to drive response decisions, regulatory compliance, and incident metrics.
- —IS: Applicable to all incident types — technical (malware, unauthorized access) and non-technical (policy violations, physical breaches) — and applied throughout the incident lifecycle.
- —IS NOT: Incident detection or alert triage. Classification begins after a potential incident is identified; it excludes the technical processes that find the incident in the first place.
- —IS NOT: Incident investigation or forensic analysis. Classification informs investigation scope but is not the investigation itself.
- —IS NOT: A one-time event. Initial classification is a hypothesis refined as investigation reveals new evidence.
- —IS NOT: A purely technical function. The classification taxonomy is a governance artifact that must align with legal, compliance, business continuity, and executive communication requirements.
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PART OFIncident Management Lifecycle (ISACA CISM Domain 4)
REQUIRESIncident Management Overview (roles, lifecycle, governance foundations)
ENABLESIncident Investigation and Evaluation (classification sets investigation scope and priority)Incident Eradication and Recovery (severity classification determines recovery resource allocation)Incident Communication and Escalation (classification drives notification timelines and stakeholder lists)Regulatory Breach Notification Compliance (GDPR Art. 33, HIPAA, PCI-DSS 12.10, SEC Cyber Rules)
RELATED TOIncident Response Planning (plans define response actions per classification tier)
CONSTRAINSIncident Metrics and Reporting (MTTR, false positive rates, and incident volume trends depend on classification consistency)