Spreadsheets break traceability. They make it harder to prove who reviewed access, when the review happened, what was approved, and whether remediation actually occurred. That creates more audit follow-up, more manual reconciliation, and more risk that the evidence trail will not stand up under scrutiny.
Why This Matters for Security Teams
SOX access evidence is supposed to show control, not just paperwork. When spreadsheets become the system of record, the evidence chain depends on manual edits, copied tabs, email attachments, and ad hoc naming conventions. That weakens auditability because approver identity, timing, remediation status, and exception handling can all drift out of sync. For teams governing service accounts, API keys, and other NHIs, the problem is amplified by scale and by the fact that access can change faster than review cycles.
This is why NHI Management Group stresses that visibility and lifecycle control are foundational, not optional. The broader NHI risk picture is severe: according to Ultimate Guide to NHIs, only 5.7% of organisations have full visibility into their service accounts, and 91.6% of secrets remain valid five days after notification. Those conditions make spreadsheet-based evidence especially fragile because the record may look complete while the underlying access state has already changed. The control intent is closer to traceable governance than document management, which is also why the OWASP Non-Human Identity Top 10 treats identity sprawl and weak lifecycle controls as core security issues.
In practice, many security teams discover the gap only after auditors ask for proof that remediation actually occurred, rather than through intentional control design.
How It Works in Practice
Effective SOX evidence for access reviews should be generated from systems that preserve immutable timestamps, reviewer identity, and before-and-after entitlement state. The practical goal is to make the evidence trail reconstructable without relying on memory or spreadsheet archaeology. For identity governance programs, that usually means the access review workflow, approval record, remediation ticket, and final verification all need to stay linked across systems.
Current guidance suggests replacing spreadsheet dependency with a workflow that captures each control point automatically:
- Review initiation tied to a defined population, such as privileged users, service accounts, or key application roles.
- Reviewer assignment recorded with time, scope, and approval context.
- Remediation actions linked to a ticket or change record, not a free-text note.
- Final validation showing that access was removed, reduced, or explicitly accepted as an exception.
For NHI-heavy environments, that workflow should also include the credential or secret state. An access review is incomplete if the spreadsheet says a key was removed but the secret still exists in a repo, CI/CD variable, or vault export. NHI Management Group highlights this risk in the Ultimate Guide to NHIs — Key Challenges and Risks, where poor visibility and mismanaged secrets are shown as persistent control failures. Standards-oriented teams often map this to evidence requirements under identity governance and access control expectations in the OWASP Non-Human Identity Top 10 and related internal control testing. These controls tend to break down when multiple business units maintain separate spreadsheets because reconciliation becomes manual, inconsistent, and difficult to defend during sampling.
Common Variations and Edge Cases
Tighter evidence controls often increase operational overhead, requiring organisations to balance audit confidence against the speed of access review completion. That tradeoff matters in environments where SOX scope spans many applications, delegated approvers, and rotating infrastructure identities. Best practice is evolving, but there is no universal standard for whether a spreadsheet is acceptable as a supplemental artifact if the system of record remains authoritative.
The edge cases are usually the ones auditors probe most aggressively. A spreadsheet may be tolerable for a one-off exception log, but it becomes weak evidence when it is the only place where approvals, remediation, and re-certification are recorded. The same issue appears when reviewers approve access in email, then someone manually updates the sheet days later. The control signal is diluted because the evidence is no longer contemporaneous.
For NHIs, the bar should be higher. Service accounts, API keys, and automation tokens can change outside human review windows, so spreadsheet cadence rarely matches reality. NHI Management Group’s data on widespread secret sprawl and excessive privileges underscores why control evidence needs to connect directly to the identity lifecycle, not just the review meeting. In highly regulated or fast-moving environments, spreadsheet evidence usually fails when auditors request a complete chain from approval to revocation and the organisation cannot prove that chain without manual reconstruction.
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-04 | Spreadsheet evidence often hides weak NHI lifecycle traceability and remediation proof. |
| NIST CSF 2.0 | PR.AC-1 | Access is ineffective if approvals and changes are not traceable and auditable. |
| NIST AI RMF | Governance requires accountable, traceable evidence even when identities are machine-driven. |
Link each access review to immutable NHI lifecycle evidence, including approval, revocation, and validation.
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
