MFA reduces login risk, but it does not answer whether the account should retain its permissions. Access reviews matter because they test entitlement validity, ownership, and business need. Without them, organisations can keep legitimate credentials attached to access that no longer belongs there.
Why This Matters for Security Teams
MFA is an authentication control, not an entitlement control. It can prove that a user or workload presented a valid second factor, but it cannot answer whether the account still needs access to production data, admin consoles, CI/CD systems, or secrets stores. That gap is why access reviews remain a core governance step in both human and non-human identity programs. The OWASP Non-Human Identity Top 10 treats over-privileged and stale access as a recurring failure mode, not an edge case.
For NHIs, the risk compounds quickly because credentials are often long-lived, embedded in automation, and reused across environments. NHI Mgmt Group has documented that Ultimate Guide to NHIs shows 97% of NHIs carry excessive privileges, which means successful authentication can still lead to unnecessary or dangerous access. In practice, many security teams encounter privilege accumulation only after an incident review, rather than through intentional entitlement cleanup.
How It Works in Practice
Access reviews ask a different question than MFA: not “Can this identity log in?” but “Should this identity still be able to do this?” That distinction matters because entitlement sprawl usually happens through project changes, inherited roles, temporary exceptions that never expire, and orphaned accounts that survive team reorgs. Best practice is to review access against business ownership, current job or workload function, and actual usage, then remove anything that is no longer justified.
For human users, review workflows typically combine manager attestation, application owner validation, and risk-based sampling. For NHIs, the review needs stronger technical evidence because there is often no direct manager. Practitioners should tie the review to service ownership, deployment pipelines, token issuance logs, and secret inventory records. The NHI lifecycle framing in NHI Lifecycle Management Guide is useful here because it connects creation, rotation, monitoring, and offboarding to the same governance chain.
- Verify the identity owner, system owner, and business purpose.
- Compare granted permissions with actual observed usage.
- Remove dormant, inherited, or duplicated privileges.
- Confirm MFA is still enabled, but do not treat it as proof of necessity.
- Revoke access immediately when ownership, role, or workload function changes.
Access reviews also support zero trust because they reduce standing privilege and expose access paths that authentication alone cannot govern. NIST guidance on identity and access management aligns with this separation of authentication from authorization, and NHI-focused guidance from NHI Mgmt Group reinforces why entitlement review is critical where secrets and service accounts are involved. These controls tend to break down when access is deeply embedded in automation and no clear owner exists because there is no reliable human to attest to necessity.
Common Variations and Edge Cases
Tighter access review programs often increase operational overhead, requiring organisations to balance cleanup rigor against delivery speed and service availability. That tradeoff becomes especially visible in fast-moving engineering environments where teams provision temporary access for incidents, migrations, or integration testing. Current guidance suggests those exceptions should be time-boxed, tracked, and revisited on a defined schedule rather than left open indefinitely.
One common edge case is shared or inherited access on service accounts. MFA may protect the admin who created the account, but it does nothing if the service account itself still has broad permissions, a valid token, or an unrotated secret. Another is third-party access, where vendors or contractors may keep credentials long after the engagement ends. The NHI research in Ultimate Guide to NHIs — Key Challenges and Risks is clear that excessive privilege and poor offboarding remain persistent issues across many organisations.
There is no universal standard for access review frequency yet, but risk-based cadences are becoming the practical norm. High-risk systems, privileged roles, secrets-bearing accounts, and internet-facing workloads should be reviewed more often than low-risk internal applications. In real environments, the weakest point is usually not login security; it is the accumulation of valid access that nobody has re-justified for months.
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 and risk surface, while NIST CSF 2.0 and NIST AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-02 | Addresses excessive privileges and stale NHI access that MFA cannot solve. |
| NIST CSF 2.0 | PR.AA-01 | Separates authentication from authorization and access governance. |
| NIST AI RMF | Supports governance of identity and access decisions for AI-enabled and automated systems. |
Review NHI entitlements regularly and remove privileges that no longer match the workload's purpose.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on June 11, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
