Ownership should sit with the control and system stakeholders who can explain the decision, produce the artefact, and correct the gap. In practice, that usually means security, IAM, PAM, and system owners sharing responsibility for the access records that support the ISMS and audit trail.
Why This Matters for Security Teams
ISO 27001 evidence for access and control reviews is not just an audit task. It is proof that access decisions are traceable, reviewable, and tied to accountable owners. If the wrong team owns the evidence, reviews become a paperwork exercise instead of a control that can detect excessive access, stale entitlements, and broken revocation. That risk is amplified for non-human identities, where secrets and service accounts often outlive the people who created them. NHI Mgmt Group notes in the Ultimate Guide to NHIs that only 5.7% of organisations have full visibility into their service accounts.
For security teams, ownership should sit with the control and system stakeholders who can explain the decision, produce the artefact, and correct the gap. That usually means security, IAM, PAM, and system owners sharing responsibility, but not sharing ambiguity. The control owner must be able to defend the review design, while the system owner must be able to show the actual access records, exceptions, and remediation steps. The danger is when evidence is collected centrally but no one can attest to its accuracy, context, or completeness. In practice, many security teams discover missing access review evidence only after an internal audit or external assessor asks for it, rather than through intentional control testing.
How It Works in Practice
Ownership works best when it follows the control lifecycle, not the organisational chart. For ISO 27001 access and control reviews, the evidence owner is usually the person or team that can answer four questions: who approved access, what was reviewed, what changed, and what was done about exceptions. Security or GRC may define the evidence standard, but IAM or PAM should produce the records, and application or platform owners should validate that the access is actually appropriate.
A practical model is to split accountability across three layers:
Control owner: defines review frequency, sampling rules, and minimum evidence requirements.
System owner: certifies that access is appropriate for the application, environment, or data set.
Evidence custodian: stores the artefact, timestamps the review, and keeps the exception trail intact.
This division matters because access reviews are only as credible as the records behind them. For non-human identities, the evidence often needs to include secret rotation status, service account ownership, and offboarding or revocation actions. That aligns with the control expectations described in the OWASP Non-Human Identity Top 10 and with guidance in the Ultimate Guide to NHIs — Key Challenges and Risks, where stale credentials and poor visibility are recurring failure points.
Current guidance suggests that access review evidence should be reproducible from source systems rather than reconstructed from spreadsheets. That means linking tickets, approval logs, PAM session records, and identity system exports to the review record. If the organisation cannot regenerate the evidence from authoritative systems, the review is probably too weak to trust. These controls tend to break down in highly delegated environments with shadow admins, shared service accounts, and fragmented SaaS ownership because no single owner can reliably attest to the full access picture.
Common Variations and Edge Cases
Tighter evidence ownership often increases operational overhead, requiring organisations to balance auditability against review fatigue. That tradeoff is real in large environments where thousands of entitlements, tokens, and service accounts change every month. In those cases, ownership is often split by control domain, with IAM owning identity records, PAM owning privileged session evidence, and application teams owning business justification.
There is no universal standard for this yet, but best practice is evolving toward named accountability for each evidence source rather than a single generic owner. For example, a cloud platform team may own evidence for role assignments, while a DevOps team owns evidence for pipeline secrets and rotation jobs. The important point is that evidence ownership should match the team that can fix the control failure, not just the team that can export a report.
That becomes especially important for NHI-heavy estates, where excessive privilege and weak offboarding are common. The underlying problem is often not missing data, but unclear accountability for who must update it when access changes. Organisations that document ownership in their ISMS, then enforce it through review cadence and remediation workflows, tend to produce cleaner audit trails and fewer repeat findings. Where ownership is unclear, control reviews often degrade into last-minute evidence collection from whichever team still has the login.
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 |
|---|---|---|
| NIST CSF 2.0 | GV.OV-01 | Supports clear oversight ownership for access review evidence. |
| OWASP Non-Human Identity Top 10 | NHI-03 | Covers rotation and review evidence for non-human credentials. |
| NIST SP 800-63 | Identity assurance principles support accountable review artefacts. |
Assign named oversight for access review evidence and verify it through recurring governance checks.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on June 7, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
