What term describes an occurrence that violates an organization’s security policy?

The term that describes an occurrence that violates an organization’s security policy is "security incident." A security incident refers to any event that potentially jeopardizes the integrity, confidentiality, or availability of an organization's information systems or data. It is significant because it not only indicates that a violation of the established security policy has occurred, but it also signals that an investigation and potential response are warranted.

This term encompasses a wide range of situations, including unauthorized access to data, malware infections, data breaches, or any other event that deviates from the defined security protocols. Recognizing an event as a security incident is crucial for organizations as it informs the incident response process, allowing them to address the issue, mitigate damage, and implement corrective measures to prevent future occurrences.

The other terms in the question—such as security event and security intrusion—are related concepts but do not fully capture the definition required. A security event may simply refer to a notable occurrence within the organization’s network, without necessarily indicating a violation of security policy. Similarly, a security intrusion typically refers to unauthorized access but doesn’t encompass the broader implications of violating organizational security policies. Therefore, "security incident" is the most appropriate term in this context.