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The loss of control, compromise, unauthorized disclosure, unauthorized acquisition, or any similar occurrence where: a person other than an authorized user accesses or potentially accesses personally identifiable information; or an authorized user accesses personally identifiable information for another than authorized purpose.
NIST SP 800-53 Rev. 5 from OMB M-17-12
NIST SP 800-53A Rev. 5 from OMB M-17-12