When proposing interim changes to the annual audit plan due to emerging risks, the most appropriate action for the CAE is to communicate with the CEO and present the revised audit plan to the board for approval. This ensures that senior management is informed and supportive of the changes, and that the board, which holds the ultimate oversight responsibility, formally approves the revised plan. References:

The IIA’s International Standards for the Professional Practice of Internal Auditing (Standards), Standard 2020 - Communication and Approval.

The IIA’s Practice Guide on Engagement Planning.