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insider

Definitions:

  Any person with authorized access to any United States Government resource to include personnel, facilities, information, equipment, networks, or systems.
Sources:
CNSSI 4009-2015 from CNSSD No. 504

  An entity inside the security perimeter that is authorized to access system resources but uses them in a way not approved by those who granted the authorization.
Sources:
NIST SP 1800-25B under Insider from RFC 4949, NIST SP 800-82r3
NIST SP 1800-26B under Insider from RFC 4949, NIST SP 800-82r3
NIST SP 800-82r3 under Insider

  Any person with authorized access to any organizational resource, to include personnel, facilities, information, equipment, networks, or systems.
Sources:
NIST SP 800-53 Rev. 5 from CNSSI 4009-2015 - Adapted

  Any person with authorized access to business resources, including personnel, facilities, information, equipment, networks, or systems.
Sources:
NISTIR 7621 Rev. 1 under Insider from CNSSI 4009-2015 - adapted