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Malicious Insider Definition: A malicious insider is an individual with authorized access to an organization's systems or data who intentionally abuses that access to compromise security or cause harm.
A malicious insider in cybersecurity refers to an individual within an organization who intentionally uses their authorized access to systems or data for malicious purposes, such as theft, sabotage, or espionage. This threat actor differs from external hackers in that they already possess legitimate credentials, making it challenging to detect their unlawful activities without advanced monitoring and access control measures in place.