Spreadsheets fail because they cannot keep pace with cloud roles, exceptions, vendor accounts, and changing ownership. They separate the review record from the live entitlement state, which makes it hard to prove that access was actually controlled. The result is slower recertification, weaker evidence, and more room for orphaned access to persist.
Why This Matters for Security Teams
Spreadsheets are attractive because they look simple, but access reviews are really a control system problem: they need current entitlement state, ownership, exception handling, and a defensible audit trail. Once cloud accounts, vendor access, service principals, and machine credentials enter the picture, static rows and manual sign-offs stop reflecting reality. That gap is exactly why auditors ask for evidence of revocation, not just evidence that someone reviewed a list. Guidance from the NIST Cybersecurity Framework 2.0 and the OWASP Non-Human Identity Top 10 both point toward continuous control monitoring, not point-in-time bookkeeping. NHI Management Group’s Ultimate Guide to NHIs — Regulatory and Audit Perspectives makes the same practical point: evidence has to connect the review decision to the live identity state. In practice, many security teams discover spreadsheet drift only after an audit sample fails or an orphaned account is used unexpectedly.
How It Works in Practice
Effective access review evidence starts with authoritative sources, not exported CSV files. The review workflow should pull current entitlements from IAM, PAM, cloud platforms, and SaaS directories, then preserve the exact state that was reviewed alongside the reviewer’s decision. That gives auditors three things: who had access, why they had it, and what changed after the review. The control objective is closer to continuous attestation than a quarterly spreadsheet exercise.
A stronger operating model usually includes:
- direct integration with identity and entitlement sources so the list is refreshed automatically
- named owners for every human and non-human identity, including service accounts and vendor identities
- exception tracking with expiry dates, compensating controls, and re-approval triggers
- immutable evidence for the review record, including timestamps and revocation outcomes
- separation between approver workflow and entitlement enforcement, so approval does not equal persistence
This is also where lifecycle discipline matters. NHI Management Group’s NHI Lifecycle Management Guide and Ultimate Guide to NHIs — Lifecycle Processes for Managing NHIs reinforce that entitlement review, rotation, and revocation are part of one control chain. For auditability, NIST and OWASP guidance both favour traceable, repeatable checks over manual interpretation. These controls tend to break down when access is granted through ad hoc break-glass paths or unmanaged third-party workflows because the live entitlement state no longer matches the exported review file.
Common Variations and Edge Cases
Tighter review controls often increase operational overhead, requiring organisations to balance evidence quality against review fatigue and ticket volume. That tradeoff becomes sharper in environments with short-lived cloud roles, temporary vendors, and non-human identities that change faster than a monthly attestation cycle. In those cases, the best practice is evolving toward event-driven reviews and just-in-time access rather than relying on static certification windows.
Some edge cases need special handling. Shared service accounts can make reviewer sign-off meaningless unless ownership is tied to a system or team. Nested group membership can hide effective access unless the review tool expands inherited rights. API keys and tokens may not appear in traditional IAM reports at all, which means the evidence set must include secret inventories and rotation logs, not just user lists. For higher-risk estates, the Top 10 NHI Issues and 52 NHI Breaches Analysis show why orphaned and overprivileged machine identities are frequently missed in spreadsheet-led programs. The practical conclusion is straightforward: if the evidence cannot prove live control, it is only a record of intent, not compliance. Current guidance suggests using continuous entitlement data wherever possible, while keeping spreadsheet exports only as a temporary review artefact, not the system of record.
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 | Spreadsheets miss non-human identities and secret-linked access. |
| NIST CSF 2.0 | PR.AC-4 | Access reviews must show least privilege and timely revocation. |
| NIST AI RMF | GOVERN | Automated or AI-assisted reviews need accountable governance and traceability. |
Use authoritative NHI inventories and automate review evidence from the live entitlement source.
