You review external users by identifying guests and other external identities whose access is no longer justified, then sending them through access reviews or lifecycle-based removal. Check whether they still need group, app or role access, and remove or disable accounts that fail review. Also verify that sponsorship, expiration and ownership rules are enforced.
What Entra ID Governance is doing when you remove external access
microsoft entra id Governance is not just checking whether a guest account exists. It is evaluating whether an external user still has a current business reason to remain in your tenant, then removing the access that no longer passes review. In practice, that means looking at the identity, the access path, and the approval or sponsorship trail together.
The review should cover the actual entitlements the external user holds, not just the account object. If a guest still has group membership, app access, or directory roles, those permissions must be justified by an owner who can attest to the need. If not, remove the access first, then disable or delete the account when your governance process says the identity is no longer needed.
That distinction matters because external users are often attached to multiple access paths at once. A guest can be harmless in one group and still overexposed through a shared app assignment or an inherited role elsewhere. A clean review is therefore about removing the business relationship that created the access, not only clicking a disable button at the end.
How to run the review so removal is defensible
Start with scope: external users, their sponsor or owner, and the resources they can reach. Then apply the governance rules that the tenant already uses for access reviews, such as expiration, recurring review, and owner attestation. If the user cannot be tied to a current sponsor, active project, or approved access purpose, that is a strong signal to revoke access.
Use the review outcome to drive the action. When access is no longer needed, remove the entitlement from the target resource rather than relying on the account to become harmless by itself. For groups and app access, revocation should be explicit and traceable. For role assignments, verify that the user is not retaining a privileged path through a separate administrative grant.
That workflow is easier to govern when the review is tied to a documented policy for external identity expiration and ownership. Third-Party, B2B and Contractor Access Guide is the most relevant internal reference here because it covers sponsorship, time limits, reviews, and third-party access removal.
For teams that need a practical operating model, Access Review Checklist helps turn the review into an auditable process, while Access Reviews and Certification Guide covers the closed-loop step that matters most, actually removing access after certification fails.
What to verify after you disable or remove the external user
Removal is not complete until you verify that the identity is no longer usable from any active path. Check that group membership, app assignments, directory roles, and linked guest access have all been removed where intended. If the account remains in the directory for lifecycle or audit reasons, confirm that it no longer authenticates to anything meaningful.
You should also confirm that sponsorship and expiration controls are still working the way you expect for the next review cycle. A recurring mistake is to clean up one stale guest while leaving the underlying process untouched, which simply recreates the same exposure later. If the same owner keeps reapproving dormant access without evidence, treat that as a process failure, not a one-off exception.
When external access is tied to broader tenant design or privileged access patterns, it is worth checking the surrounding identity controls too. Active Directory and Entra ID Hardening Guide is useful where guest access intersects with privileged groups, delegation, or hybrid identity design. If you are using privileged workflows for external administration, Privileged Identity Management (PIM) Guide helps distinguish standing access from time-bound activation.
Risk and Threat Considerations
External users that are left in place after their business need ends create unnecessary exposure, especially when they still hold group access, app access, or administrative roles. The risk is not only unauthorized use, but also stale trust: an old guest account can become a convenient foothold if its access was never fully revoked or was inherited through another assignment.
Failure mechanism: Sponsorship, expiration, or ownership controls drift out of sync with actual business need, so the external identity keeps valid entitlements after the relationship should have ended.
Impact: Dormant external access can turn into data exposure, privilege misuse, or delayed detection of abuse, especially when the account still maps to sensitive apps or role assignments.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
CIS Controls v8, NIST SP 800-53 Rev 5 and CSA Cloud Controls Matrix set the technical controls, while ISO/IEC 27001:2022 defines the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | CIS-5 — Account Management | External user review and removal are core account lifecycle controls. |
| Recommendation — Review external accounts regularly and remove access that no longer has a business need. | ||
| NIST SP 800-53 Rev 5 | AC-2 — Account Management | This is about reviewing, disabling, and removing external accounts and their access. |
| AC-6 — Least Privilege | External users should keep only the minimum access needed while they remain active. | |
| Recommendation — Disable or remove external accounts when continued access is no longer authorized. Restrict external users to the minimum entitlements required for the approved purpose. | ||
| ISO/IEC 27001:2022 | A.5.18 — Access rights | The topic is about reviewing and revoking access rights for external users. |
| Recommendation — Review and revoke external access rights when they are no longer justified. | ||
| CSA Cloud Controls Matrix | IAM — Identity and Access Management | Cloud identity governance covers external user review, sponsorship, and revocation. |
| Recommendation — Apply IAM governance to certify, expire, and revoke external user access. | ||
Practitioner Guidance
What to verify: Make sure the review is checking the actual entitlements, not just the account status. The practical question is whether the user still has a live path to data, applications, or administrative functions, because that is what determines whether removal is necessary.
Decision rule: If the external user cannot show a current sponsor, active project, or other approved access purpose, revoke the access first and then decide whether the guest object should remain for audit or be disabled or deleted.
Common mistake: Treating a passed access review as equivalent to continued need. A review only proves the review process happened; it does not prove the access is still justified unless the owner can defend each entitlement.
Practitioner takeaway: The safest operating model is to remove the entitlement when the business justification disappears, then keep the identity only if you still need it for traceability or lifecycle control.
Related resources from NHI Mgmt Group
- How do you access and review activity logs in Microsoft Entra ID?
- How do you create a security plan for external user access in Microsoft Entra ID?
- How do you secure external access to Teams, SharePoint and OneDrive with Microsoft Entra ID?
- How do you secure external user access with Conditional Access in Microsoft Entra ID?