Ensure that guest user access is restricted

Why This Matters

Allowing guests unrestricted access to your Microsoft 365 tenant can lead to data exposure, unauthorized changes, or lateral movement by external identities. Restricting guest user privileges reduces the risk of sensitive information being accessed or modified by users outside your organization. For IT administrators, tightening guest access is a foundational step in securing hybrid or external collaboration scenarios.

What Aether365 Checks

This check verifies that guest user access is restricted in your Microsoft 365 tenant, ensuring external users have the minimum necessary permissions. In the Aether365 dashboard, this appears under the Microsoft 365 checks category, aligned with CIS benchmark control CIS.M365.5.1.6.2.