If operational management has not implemented effective actions to address a significant control breach, the most appropriate next step for the chief audit executive is to discuss the matter with senior management. This step involves escalating the issue to a higher level of authority to ensure that the risks associated with the control breach are properly understood and addressed. If senior management fails to take appropriate action, the CAE may then escalate the issue to the board.
Reference:
IIA Standard 2500: Monitoring Progress
IIA Practice Guide: Auditing Organizational Governance