The migration decision and the assurance gap
Cloud migration removes the network perimeter that traditional security controls were designed to protect. The migration decision is typically framed around capability, cost and delivery. The question of how access to critical workloads will be governed after migration is often addressed at a technical level without board visibility, treated as an implementation detail rather than a governance decision.
Zero Trust provides the governance framework for access to cloud workloads: who can reach what, under what conditions, and how that access is reviewed. That framework is a governance decision, not a technical one, and it belongs in the same approval process as the migration itself.
What the board should be asking
Zero Trust gives a board three specific questions to put to its security leadership. Who owns the policy governing access to cloud workloads, and what does that policy say? Which workloads are critical, and who currently has access to them? And how is that access reviewed, at what frequency, and by whom?
These questions are not answered by default in most cloud programmes. Traditional security governance was built around the network perimeter: if a user was inside, access was assumed. Cloud removes that boundary. Zero Trust replaces the perimeter assumption with access governance that is explicit, documented and reviewable. For a board, the assurance question changes from whether the perimeter is secure to whether access to critical workloads is governed and reviewed on a defined cycle.
A practical test for the board
If the three questions in the previous section can be answered from current reporting without special preparation, the access governance model is working at board level. If they require preparation that falls outside normal reporting cycles, the model is either absent or not surfacing to board oversight.
An organisation may have documented access policy internally without it reaching board accountability or regular review. Access managed at an operational level, with no board oversight and no escalation mechanism, carries the same governance gap as having no policy. The question to put to security leadership is not whether a policy exists, but whether it governs access at a level the board can account for.