They should treat NHIs as lifecycle-managed identities, not as background system artefacts. That means assigning ownership, defining expiration expectations, and ensuring the review process can validate business purpose and retirement state, not just confirm that the account exists.
How should NHI access reviews be governed?
Access reviews should treat a non-human identity as a governed identity with a lifecycle, not as a technical object that merely appears in a system list. The reviewer needs enough context to judge whether the account still has a valid business purpose, whether the owner is accountable, and whether retirement or rotation is overdue. That makes the review an entitlement and lifecycle decision, not a checkbox.
What should reviewers validate for an NHI?
The review should answer four practical questions: who owns it, what business process depends on it, whether the permissions still match that use case, and whether the identity is still active for a good reason. If the review cannot surface ownership or purpose, the item should be treated as an exception, not as approved by default. This is where lifecycle governance matters most.
For accounts that service integrations, automation, or application-to-application access, the reviewer should also check whether the credential model still fits the risk. Long-lived access, shared credentials, and stale entitlements are the patterns that most often turn a review into a rubber stamp. A foundational identity and access governance model is useful here because it frames access reviews as entitlement decisions, not just inventory checks.
What does good NHI governance look like in a financial institution?
Good governance links the review process to an inventory, an owner, and a retirement path. If an NHI exists, it should have an accountable owner, an expected expiry or rotation pattern, and a clear rule for when it is removed, re-certified, or escalated. A review process that only confirms existence cannot tell you whether the identity is still justified, so it will miss orphaned or over-retained access.
That is why lifecycle management is central. A NHI lifecycle management guide and the ownership and accountability guidance both reinforce the same practical point: reviews should verify that the identity still has a legitimate business use and an active owner who can answer for it.
Risk and Threat Considerations
Access reviews that treat NHIs as background artefacts create hidden exposure. The main failure mode is approval by familiarity: the account looks normal, so reviewers sign off without checking purpose, expiry, or owner accountability. Over time, that leaves dormant access, over-privileged integrations, and orphaned credentials in place longer than the business intends.
Failure mechanism: Reviewers confirm presence, not legitimacy, so stale NHIs remain active after the business process changes or the owner leaves. In a financial institution, that can preserve access into regulated systems, payment flows, or customer-data paths long after the original use case has ended.
Impact: The organisation accumulates unowned access paths that are harder to attest, harder to retire, and easier to abuse if a credential is exposed. The problem is not only leakage, but weak accountability during audit and incident response, because nobody can quickly explain why the NHI still exists.
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 and CIS Controls v8 set the technical controls, while ISO/IEC 27001:2022 and PCI DSS v4.0 define the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | AC-2 — Account Management | NHI access reviews are account lifecycle decisions requiring ownership and removal criteria. |
| IA-5 — Authenticator Management | NHI reviews depend on credential expiry, rotation and retirement expectations. | |
| AU-6 — Audit Record Review, Analysis, and Reporting | Access reviews need evidence that NHI activity and ownership checks were actually performed. | |
| Recommendation — Review NHI accounts on a defined cadence and disable or remove ones without current business justification. Track NHI secrets and tokens through issuance, rotation, expiration and revocation. Use audit evidence to confirm NHI review decisions, exceptions and remediation were completed. | ||
| ISO/IEC 27001:2022 | A.5.16 — Identity management | NHI reviews require governed identity records with ownership and lifecycle state. |
| A.5.18 — Access rights | The question is about recertifying whether NHI access rights should remain in force. | |
| Recommendation — Maintain authoritative identity records for NHIs and keep them current through the review cycle. Recertify NHI access rights against current business need and revoke stale permissions. | ||
| CIS Controls v8 | CIS-5 — Account Management | The answer focuses on governed lifecycle handling of NHI accounts in access reviews. |
| Recommendation — Inventory NHI accounts, assign owners and remove inactive or unjustified access quickly. | ||
| PCI DSS v4.0 | 7 — Restrict Access by Business Need to Know | Financial institutions should approve NHI access only when a current business need exists. |
| 8.6 — Management of System and Application Accounts and Credentials | NHI reviews must validate the continued need for system and application accounts and their credentials. | |
| Recommendation — Limit NHI access to the minimum required business purpose and remove excess rights. Control system and application accounts so their credentials are managed, rotated and retired on schedule. | ||
Practitioner Guidance
What to verify: Require each NHI in scope for review to map to an owner, a business purpose, a renewal or expiry expectation, and a retirement condition. If any of those fields are missing, treat the review item as unresolved rather than approved.
Decision rule: If the reviewer cannot explain why the account must still exist, the safer outcome is removal, re-certification, or temporary suspension pending validation. For financial institutions, that rule is especially important where the identity can reach customer, trading, treasury, or payment systems.
Practitioner takeaway: The right standard for NHI access reviews is not “does the account exist?”, but “does it still deserve to exist, and can someone accountable prove why?”