They should reconcile identity sources before the certification window opens, then validate that every account, entitlement, and NHI is in scope. The practical test is whether the review population matches authoritative records from HR, IGA, PAM, and application systems. If it does not, the organisation is certifying a partial picture and should stop treating that as acceptable.
Why This Matters for Security Teams
Incomplete review populations turn certification into theatre. In a financial institution, the risk is not just that a user or service account is missed, but that an entitlement, API key, or privileged NHI remains active without challenge. That creates audit exposure, weakens segregation of duties, and can hide orphaned access in core banking, payments, and fraud tooling. Best practice is to reconcile HR, IGA, PAM, and application records before the window opens, then freeze scope when the authoritative picture is confirmed.
This is especially important for NHIs because they are often undercounted and over-privileged. NHI Management Group research shows only 5.7% of organisations have full visibility into their service accounts, and The State of Non-Human Identity Security reports that confidence in securing NHIs remains low across the market. For review teams, that means any missing population is a control failure, not a clerical inconvenience. Current guidance aligns with least privilege principles in the OWASP Non-Human Identity Top 10 and the identity assurance emphasis in NIST SP 800-63 Digital Identity Guidelines.
In practice, many security teams discover incomplete populations only after a regulator, internal audit, or incident response exercise has already exposed the gap.
How It Works in Practice
The operational fix is straightforward, but it has to be disciplined. First, define authoritative sources for each identity class. HR is usually authoritative for people, while IGA, PAM, CMDB, cloud directories, and application inventories often hold the best records for NHIs and machine entitlements. Then compare those sources before certification begins, not during it. If records conflict, resolve ownership, lifecycle state, and business justification before any reviewer sees the list.
For NHIs, the review should include service accounts, workload identities, API keys, secrets, certificates, and agent identities where applicable. The question is not simply whether the account exists, but whether it still has a legitimate purpose, whether its privileges match that purpose, and whether a compensating control such as Ultimate Guide to NHIs or NHI Lifecycle Management Guide can prove the entitlement is current. In many financial environments, that means pulling evidence from application owners, not assuming a system-of-record is complete.
- Reconcile identity sources before the attestation window opens.
- Tag every record with owner, purpose, system, and expiration date.
- Exclude unresolved exceptions from certification until they are remediated.
- Use PAM and secret inventory reports to catch accounts that never appear in HR or IGA.
- Escalate missing populations as scope defects, not reviewer backlog.
When executed well, the certification becomes a validation of control effectiveness rather than a search for unknown identities. These controls tend to break down when legacy banking platforms, shared service accounts, or unmanaged third-party integrations keep authoritative data outside the review workflow.
Common Variations and Edge Cases
Tighter scoping often increases operational overhead, requiring institutions to balance review quality against deadline pressure. That tradeoff becomes sharp in merged environments, regulated outsourcing arrangements, and older platforms that cannot easily export entitlement data. There is no universal standard for this yet, but current guidance suggests treating gaps differently from exceptions: a justified exception can be reviewed, while a missing population should stop the certification until the scope is repaired.
Two edge cases matter most. First, shared or break-glass accounts may have limited ownership metadata, but they still require explicit review and compensating approval paths. Second, automated or ephemeral access can disappear before reviewers act, so logs, issuance records, and policy decisions become the evidence instead of a static account list. That is why the review process should include evidence from lifecycle tooling, not just a point-in-time export. The broader risk is well documented in 52 NHI Breaches Analysis and the identity governance patterns described in Ultimate Guide to NHIs — Key Challenges and Risks.
Financial institutions should also align the review to NIST SP 800-63 Digital Identity Guidelines for assurance and to the OWASP Non-Human Identity Top 10 for machine identity risk patterns. Where the environment includes autonomous agents or tool-using workflows, the same logic applies, but ownership and runtime authority need even tighter evidence.
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 SP 800-63 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-03 | Missing populations usually trace to poor inventory and lifecycle control. |
| NIST CSF 2.0 | PR.AC-4 | Least-privilege review depends on complete entitlement visibility. |
| NIST SP 800-63 | Identity proofing and assurance inform who should be in the review population. |
Use authoritative identity records and assurance evidence to validate certification scope.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on June 2, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
