MFA and contextual controls reduce the chance of risky entry, but they do not correct access that was granted months ago and is no longer justified. Reviews matter because authorisation drift is a separate problem from authentication. Without certification, users can remain over-privileged even in strong sign-in environments.
Why This Matters for Security Teams
MFA and contextual access control improve sign-in assurance, but they do not answer a separate governance question: should the account still have that access at all? user access review are the control that catches entitlement drift, inherited permissions, and stale admin access after job changes, project completion, or vendor transitions. NHI Management Group’s Ultimate Guide to NHIs shows how access sprawl becomes dangerous when identities outlive the business need that created them.
This matters because authentication controls can be strong while authorisation remains broadly permissive. In practice, a valid MFA prompt only proves the user is who they claim to be at login. It does not prove the role is still correct, the entitlement is still required, or the privilege still aligns to current duties. That is why review cycles remain foundational in standards-oriented programs, including guidance reflected in the OWASP Non-Human Identity Top 10, even when the immediate question is about human access. In practice, many security teams encounter over-privileged accounts only after an audit, incident, or access request mismatch exposes the drift.
How It Works in Practice
Access reviews are a certification process: managers, application owners, and system custodians are asked to confirm whether access is still justified. The effective pattern is to review by entitlement, not just by person, because one user may hold multiple roles across SaaS, cloud, endpoint, and internal apps. High-risk entitlements such as privileged admin rights, finance approvals, production support access, and delegated authentication deserve shorter review intervals than low-risk access.
Strong programs pair reviews with evidence from joiner-mover-leaver workflows, role definitions, and last-use data. That lets reviewers distinguish legitimate privilege from dormant entitlement. Current guidance suggests that review outcomes should be actionable: keep, reduce, revoke, or replace with a narrower role. The control is stronger when integrated with provisioning systems so decisions are enforced quickly rather than recorded and forgotten. NHI Management Group’s NHI Lifecycle Management Guide is useful here because the same lifecycle logic applies to both human and non-human identities, especially when access must be removed at offboarding.
- Review privileged and sensitive access more frequently than ordinary access.
- Use application owners to validate business need, not only managers to approve names.
- Flag dormant access, shared accounts, and exception-based entitlements for immediate follow-up.
- Track remediation so revocations actually happen, instead of stopping at certification.
Where this guidance breaks down is in large, fragmented environments with poor entitlement inventories, because reviewers cannot reliably judge access they cannot fully see.
Common Variations and Edge Cases
Tighter review cadence often increases operational overhead, requiring organisations to balance risk reduction against reviewer fatigue and remediation backlog. That tradeoff is real, especially in enterprises with thousands of entitlements and dozens of SaaS platforms. Best practice is evolving, but there is no universal standard for how much automation should replace human attestation.
One common edge case is emergency or break-glass access. Those privileges may be intentionally broad, but they still need review after use and should not remain as standing access. Another is service-linked human access, where a person needs temporary elevated rights to support automation, testing, or production changes. Those cases are often better handled through just-in-time access than by leaving broad standing access in place.
Reviews also fail when the reviewer is too far removed from the actual system. A line manager may know the job title but not the application dependency, while a system owner may know the system but not the business change that made access obsolete. That is why leading programs combine access reviews with least privilege, access analytics, and exception tracking. For broader control context, the Ultimate Guide to NHIs — Key Challenges and Risks and the 52 NHI Breaches Analysis show how stale access compounds into real exposure when certification is weak or absent.
These controls tend to break down when entitlements are not catalogued consistently across SaaS, cloud, and legacy systems because reviewers end up certifying incomplete data.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 address the attack surface, NIST CSF 2.0 set the technical controls, and PCI DSS v4.0 define the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | PR.AC-4 | Access review supports ongoing least privilege and entitlement governance. |
| PCI DSS v4.0 | 7.2.5 | Periodic review of access aligns with enforcing least privilege for sensitive systems. |
| OWASP Non-Human Identity Top 10 | NHI-03 | Stale or excessive access is a core identity lifecycle risk addressed by this control. |
Review and remove unnecessary user access on a defined schedule, especially for privileged accounts.
