Spreadsheets cannot reliably model cross-application conflicts, ownership changes, expiry dates, or remediation status at scale. They also encourage rubber-stamping because reviewers see lists, not business context. When the review process is manual, the organisation often checks activity, not justification. That is why toxic access can survive multiple review cycles without being meaningfully challenged.
Why This Matters for Security Teams
Spreadsheet-based access reviews fail because they turn entitlement governance into a static list exercise instead of a context-driven control. That is especially dangerous for NHI-heavy environments, where service accounts, API keys, tokens, and agent credentials change faster than review cycles. The Ultimate Guide to NHIs frames this as an identity lifecycle problem, not a clerical one. The risk is not only missed entitlements, but also stale ownership, duplicate accounts, and delayed revocation that survive because no one can reliably reconcile the spreadsheet back to live systems.
Manual review files also encourage checkbox behaviour. Reviewers see rows, not business purpose, so they approve access they cannot validate or delay decisions until the next cycle. That creates a false sense of control, even when the underlying access graph is already inconsistent. The OWASP Non-Human Identity Top 10 treats poor visibility and credential sprawl as recurring failure modes because they are easy to normalise in operations. In practice, many security teams discover toxic access only after an incident review, rather than through intentional certification.
How It Works in Practice
effective access reviews need source-of-truth data, not manually maintained worksheets. The review should pull from IAM, PAM, cloud platforms, code repositories, secret stores, and application logs so each entitlement is evaluated against current ownership, expiry, last use, and business justification. For NHI governance, that means reviewing the workload identity, not just the secret attached to it. A token may still exist after the service that requested it has been retired, and a spreadsheet rarely captures that lifecycle drift.
Current guidance suggests pairing access reviews with automated evidence collection and remediation workflows. That usually means:
- Linking each entitlement to a named owner and system of record.
- Checking whether the access is active, expired, or unused.
- Recording the reviewer decision, rationale, and remediation SLA in a system, not a file.
- Revoking or downgrading access automatically when the review outcome is negative.
The NHI Lifecycle Management Guide is useful here because lifecycle controls explain why certification must follow provisioning, rotation, and decommissioning. A spreadsheet cannot reliably express whether a secret has already been rotated, whether the owner changed, or whether access is inherited through another platform. That is why teams should pair reviews with policy-backed controls and standards such as the NIST Cybersecurity Framework and identity governance practices described in OWASP Non-Human Identity Top 10.
These controls tend to break down when entitlement data is scattered across many systems and the organisation cannot reconcile ownership or usage in near real time.
Common Variations and Edge Cases
Tighter review controls often increase operational overhead, requiring organisations to balance auditability against reviewer fatigue and remediation capacity. That tradeoff is most visible in environments with thousands of NHIs, short-lived CI/CD credentials, or rotating cloud roles. Best practice is evolving, but there is no universal standard for forcing every entitlement through the same spreadsheet workflow.
Some teams try to salvage spreadsheets by adding colour codes, comments, and expiry columns. That can help for small, stable environments, but it becomes unreliable when access is inherited, federated, or recreated automatically by pipelines. In those cases, the review must distinguish between human access, workload access, and delegated machine access. The 52 NHI Breaches Analysis is a reminder that visibility gaps and stale credentials are not theoretical issues; they repeatedly show up in post-incident patterns.
Another edge case is when reviewers are technically capable but lack business context. They can confirm that access exists, yet still cannot determine whether it is justified for a current project, vendor relationship, or automated task. In those situations, the answer is not more columns. It is better system integration, better ownership metadata, and automated removal of access that no longer maps to an active purpose.
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-01 | Poor review visibility lets stale non-human access persist unnoticed. |
| NIST CSF 2.0 | PR.AA-01 | Access review failures are identity assurance and entitlement governance gaps. |
| NIST AI RMF | Governance is needed where automated systems create or change access context rapidly. |
Establish accountable review workflows that capture context, justification, and remediation for machine-driven access.
Related resources from NHI Mgmt Group
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on June 24, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
