Accountability sits with the organisation’s access governance and control owners, because SoD is a policy control that must be enforced before access is granted. Approval workflows should involve compliance or GRC teams where risk is material, and managers should be able to see the business impact of granting access. Audit evidence should show who reviewed the risk and why.
Why This Matters for Security Teams
SoD approvals without compliance review are not a paperwork issue; they are a governance failure that can turn a controlled exception into an unowned risk. When a manager or system owner can approve access without a second line review, the organisation loses the check that should catch conflicts between job function, privilege, and segregation requirements. That creates audit exposure, weakens accountability, and makes it harder to prove that access was granted for a valid business need.
This is especially important where privileged roles, finance workflows, production support, or NHI-related access are involved, because the same approval path that seems efficient can also normalise exceptions. Current guidance in the NIST Cybersecurity Framework 2.0 and Ultimate Guide to NHIs – Regulatory and Audit Perspectives both point toward accountable access governance, documented review, and evidence that risk decisions were made by the right control owners. In practice, many security teams encounter SoD violations only after an audit finding or incident has already forced a review.
How It Works in Practice
Accountability should be assigned to the control owner who allowed the exception to pass, not just the person who clicked approve. In a mature workflow, the business manager may sponsor the request, but compliance, GRC, or access governance must validate the SoD conflict before entitlements are issued. The decision record should show who assessed the conflict, what compensating controls were accepted, and why the residual risk was tolerable.
This is where policy discipline matters. Under NIST SP 800-53 Rev 5 Security and Privacy Controls, organisations should map approval logic to least privilege, separation of duties, and auditability requirements. For NHI-heavy environments, the same logic applies to service accounts, API keys, and CI/CD identities. NHIs are often granted access faster than human users, which is why the Top 10 NHI Issues research consistently frames approval gaps as a governance problem, not just an identity administration problem. A sound process uses role design, exception expiry, and post-approval review so that access does not become permanent by default.
- Define the control owner for each SoD rule and each exception path.
- Require compliance review when the conflict touches regulated data, finance, production, or privileged access.
- Store the approval rationale, approver identity, and compensating controls in audit-ready logs.
- Set expiry dates on exceptions and force revalidation before renewal.
This guidance tends to break down in fast-moving DevOps and emergency support environments because temporary exceptions are often created faster than governance teams can review them.
Common Variations and Edge Cases
Tighter SoD enforcement often increases operational friction, requiring organisations to balance speed of access against the cost of manual review. That tradeoff is real, especially when incident response, production support, or small control teams need urgent access under pressure. Best practice is evolving, but current guidance suggests that speed should come from pre-approved patterns, not from bypassing review entirely.
In some environments, a line manager may be permitted to approve low-risk access, while high-risk entitlements require dual approval or compliance sign-off. Where the risk is material, the absence of compliance review usually means the exception is not really controlled. The same principle applies to NHI governance, where excessive privilege and weak lifecycle controls are common; Ultimate Guide to NHIs – Lifecycle Processes for Managing NHIs is useful for tying approval decisions to expiry, rotation, and offboarding. ISO-aligned control frameworks such as ISO/IEC 27001:2022 Information Security Management support this same expectation of defined responsibility and evidence. The exception becomes especially risky when approvers are also the beneficiaries of the access, because accountability then shifts from governance to self-approval, which most audit teams will reject.
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 and CSA MAESTRO address the attack and risk surface, while NIST CSF 2.0, NIST SP 800-53 Rev 5 and NIST AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | PR.AC-4 | Access approvals must enforce least privilege and separation of duties. |
| NIST SP 800-53 Rev 5 | AC-5 | AC-5 directly addresses separation of duties and conflicting access. |
| OWASP Non-Human Identity Top 10 | NHI-06 | NHI governance must prevent excessive privilege and unreviewed exceptions. |
| CSA MAESTRO | GOV-03 | Governance for agentic and non-human access needs clear approval accountability. |
| NIST AI RMF | AI RMF governance emphasizes accountable oversight and documented risk decisions. |
Require documented risk review before access is granted and retain evidence for each exception.
Related resources from NHI Mgmt Group
- Who is accountable when a high-risk SaaS or AI tool is used without documented purpose or review?
- Who is accountable when AI is deployed without a formal decision or review?
- Who is accountable for CRA compliance across the product supply chain?
- Who is accountable when a payments business relies on partners for fraud and compliance decisions?
