They should treat cleanup as the prerequisite when stale objects are inflating the review surface. Access reviews are more effective when the directory has already been pruned, because reviewers spend less time triaging obsolete entries and more time judging real entitlements.
Why Directory Cleanup Comes Before Access Reviews
Active Directory cleanup should usually lead when stale objects, orphaned groups, disabled-but-still-linked accounts, or duplicated role structures are inflating the review population. A review process can only certify what it can meaningfully present to reviewers, so pruning obsolete entries first makes the exercise smaller, clearer, and more defensible.
Cleanup also improves the quality of the evidence behind the review. If inactive accounts, old service principals, or long-retired group memberships remain in the directory, reviewers end up approving noise, which weakens the value of the certification cycle and makes remediation less targeted.
When cleanup is complete enough to restore a reliable inventory, access reviews become the better control for judging whether the remaining access is still appropriate, especially for privileged groups, inherited group nesting, and long-lived entitlement patterns.
How Cleanup Changes the Access Review Workflow
Cleanup changes the workflow from broad triage to focused decision-making. Instead of asking reviewers to interpret every record as if it were current, teams can reserve the review for active entitlements that still matter to the business, reducing rubber-stamping and speeding up escalation of genuinely risky access.
The practical question is whether the directory is materially distorting the review surface. If yes, cleanup is the prerequisite control. If no, and the directory is already reasonably current, access reviews can proceed in parallel and be used to catch over-entitlement, bad inheritance, or role drift that cleanup alone will not solve.
In most environments, the best sequence is iterative rather than one-and-done: remove obvious stale objects, run the review on the cleaned set, then feed confirmed removals, exceptions, and ownership gaps back into the directory hygiene process so the next cycle is smaller and more accurate.
What Good Prioritisation Looks Like in Practice
Teams should prioritise the work that most improves signal quality. If the directory contains many stale objects, cleanup comes first; if the directory is already reasonably clean but business risk is driven by excessive live access, reviews deserve the first pass. The decision rule is simple: fix inventory quality before asking humans to approve inventory quality.
That logic aligns well with identity governance practice. A lifecycle-oriented view of directory hygiene, review design, and entitlement ownership is covered in the IAM and IGA Basics guide, while a more operational view of access reviews and certification shows how to cut review volume and focus on real entitlements.
For directory-specific remediation, the Active Directory and Entra ID Hardening Guide is the better fit when cleanup also needs to address privileged groups, delegation, and other structural issues that create recurring review noise.
Risk and Threat Considerations
Stale directory objects are not just administrative clutter, they are a control weakness. They can hide unused access paths, inflate reviewer workload, and make it easier for excessive or forgotten entitlements to survive multiple certification cycles without meaningful challenge.
Failure mechanism: Obsolete accounts, groups, and nested memberships remain in the directory, so reviewers spend time validating records that should already have been removed. The result is review fatigue, weaker challenge quality, and a higher chance that real over-privilege is approved by default.
Impact: The organisation keeps carrying access that no longer has a business owner, a current user, or a clear justification. That increases the chance of privilege creep, hidden lateral movement paths, and audit findings that show the review program is producing activity rather than risk reduction.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST SP 800-53 Rev 5, CIS Controls v8 and OWASP ASVS set the technical controls, while ISO/IEC 27001:2022 defines the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | IA-5 — Authenticator Management | Cleanup and review both depend on credential lifecycle hygiene for stale identities. |
| AC-2 — Account Management | Active Directory cleanup is fundamentally about removing or governing inactive and orphaned accounts. | |
| AC-6 — Least Privilege | Access reviews are used to detect and reduce excessive live entitlements after cleanup. | |
| Recommendation — Revoke or rotate stale authenticators before recertifying remaining access. Disable, remove, and formally approve accounts as part of the account lifecycle. Remove unnecessary entitlements and privilege assignments during the review cycle. | ||
| ISO/IEC 27001:2022 | A.5.15 — Access control | The question is about controlling who should retain access after directory hygiene is restored. |
| Recommendation — Define access rules that require current ownership and business need before approval. | ||
| CIS Controls v8 | CIS-5 — Account Management | Directory cleanup and periodic review both sit inside account and access lifecycle control. |
| Recommendation — Maintain accurate account inventories and remove stale access paths on schedule. | ||
| OWASP ASVS | V8 — Authorization | The review side is about validating whether current entitlements still authorize the right actions. |
| Recommendation — Verify that effective permissions match current business roles before granting continued access. | ||
Practitioner Guidance
What to prioritise: Start with cleanup when the directory has obvious staleness, duplicate roles, or orphaned groups that will otherwise dominate the review queue. Save reviewer attention for current entitlements that still map to active business ownership.
What to verify: Before trusting an access review, confirm that the directory inventory is current enough to support it, especially for privileged groups, inherited memberships, and accounts that have not been used recently. If ownership or business purpose cannot be shown, treat that as a cleanup task, not a certification decision.
Practitioner takeaway: The goal is not to choose cleanup or access reviews in isolation, it is to sequence them so the review process operates on a directory that is already accurate enough to produce decisions instead of noise.
Related resources from NHI Mgmt Group
- How should security teams run access reviews for non-human identities?
- How should security teams govern Active Directory service accounts?
- What do security teams get wrong about privileged access reviews in Active Directory?
- How should security teams govern access reviews in complex Active Directory environments with nested groups and multiple domains?