Because access reviews show whether entitlements are still justified, while logging shows whether system activity can be traced and defended. Together, they prove that controls operate consistently rather than existing only as documents. When either is weak, auditors cannot rely on the control environment and the organisation loses evidence quality.
Why This Matters for Security Teams
ITGC audits concentrate on access reviews and logging because those two controls reveal whether access is still appropriate and whether activity can be reconstructed after the fact. Without recurring review evidence, entitlements drift into a state auditors cannot defend. Without reliable logs, the control may exist on paper but cannot be proven in operation. That is why audit teams keep returning to the same two questions: who still has access, and what did they do with it?
This matters even more where non-human identities are involved. NHIs are often over-privileged, poorly inventoried, and harder to monitor than human users, which makes access review evidence and log quality central to proving control effectiveness. NHIMG’s Ultimate Guide to NHIs notes that NHIs outnumber human identities by 25x to 50x in modern enterprises, which helps explain why audit evidence becomes noisy so quickly. The broader control logic also aligns with the NIST Cybersecurity Framework 2.0 emphasis on accountability, traceability, and continuous governance.
Practitioners usually discover the weakness when an entitlement cannot be justified or a log trail cannot support a transaction, rather than through a clean preventive control test.
How It Works in Practice
Access reviews are designed to answer whether a user, service account, API key, or automation still needs its current privileges. Logging answers whether the system can show who accessed what, when, from where, and with what outcome. In audit terms, the first control tests authorization; the second tests detectability and evidence retention. Together they create a defensible chain from permission to activity.
For NHIs, the review process must be broader than a quarterly spreadsheet sign-off. Mature programs reconcile inventory, ownership, purpose, scope, and expiry across service accounts, secrets, and machine-to-machine integrations. That is where lifecycle discipline matters. NHIMG’s NHI Lifecycle Management Guide and Lifecycle Processes for Managing NHIs both reinforce that offboarding and rotation are not optional cleanup tasks but core governance steps.
- Validate that each entitlement has a named owner and business justification.
- Separate persistent roles from temporary or task-based access.
- Confirm that logs cover authentication, privilege use, and sensitive actions.
- Retain logs long enough to support investigation and audit sampling.
- Correlate access review findings with observed activity to spot dormant but risky access.
Current guidance suggests the strongest evidence comes from automated reconciliation, not manual attestations alone. In practice, this often means pairing IAM data, PAM records, and SIEM logs so auditors can see both entitlement state and actual use. NHIMG’s Regulatory and Audit Perspectives section is especially relevant here because it frames auditability as an operational discipline, not a documentation exercise.
These controls tend to break down when logs are fragmented across SaaS, cloud, and CI/CD systems because no single source can prove the full control path.
Common Variations and Edge Cases
Tighter access review and logging requirements often increase operational overhead, requiring organisations to balance auditability against administrative burden. That tradeoff is most visible in high-change environments where automation, ephemeral workloads, and third-party integrations create constant entitlement churn.
There is no universal standard for review cadence beyond the control objective itself, so best practice is evolving toward risk-based frequency. High-impact systems, privileged accounts, and NHIs tied to production changes usually need more frequent review than low-risk business tools. The same is true for logging depth: some environments only need standard access logs, while others require session capture, command-level detail, or immutable storage.
Edge cases also arise when logs are technically present but not useful. For example, short retention windows, missing time synchronisation, or incomplete identity attribution can make evidence weak even though the platform “logs.” On the access side, dormant service accounts and shared integrations can pass review mechanically while still hiding unacceptable privilege sprawl. That is why many teams use NHIMG’s Top 10 NHI Issues as a practical lens for finding control gaps that conventional ITGC templates miss.
Industry guidance increasingly points to structured accountability, but exact implementation varies by architecture and regulator. The important point is simple: if the organisation cannot explain why access exists and cannot prove how it was used, the control will fail under audit scrutiny.
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 CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | PR.AC-4 | Access reviews validate that privileges remain appropriate and authorized. |
| NIST CSF 2.0 | DE.CM-1 | Logging supports ongoing monitoring and traceability of system activity. |
| OWASP Non-Human Identity Top 10 | NHI-03 | NHI credential lifecycle and review issues drive audit evidence gaps. |
Reconcile entitlements regularly and remove access that no longer matches business need.
Related resources from NHI Mgmt Group
Deepen Your Knowledge
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
