organizational task

This is a compositional phrase, not a term of art. "Organizational tasks" simply means the work activities, duties, and functions that a person (or automated process) is formally assigned to carry out on behalf of the organization — the ordinary sense of both words stacked together. In NIST SP 800-53 AC-6 (Least Privilege), the phrase appears as the boundary criterion for authorized access: systems should "allow only authorized accesses for users (or processes acting on behalf of users) that are necessary to accomplish assigned organizational tasks." NIST's own glossary defines a "task" simply as "an activity that is directed toward the achievement of organizational objectives," confirming that "organizational tasks" carries no meaning beyond that combination. Earlier NIST SP 800-53 revisions express the same idea slightly differently — "tasks in accordance with organizational missions and business functions" — showing that the expression is paraphrasable and interchangeable, which is characteristic of a compositional phrase rather than a fixed term of art.