Accountability should sit with the business owner for the access decision, the application owner for the control, and the identity team for the workflow. Frameworks such as the NIST Cybersecurity Framework 2.0 help map that responsibility to governance, but the organisation still has to prove who approved what and why.
Why This Matters for Security Teams
Over-provisioned access is not just an IAM hygiene problem. In hybrid estates, the same entitlement can be approved in one system, inherited in another, and never visible to the team that owns the business risk. That creates a gap between technical control and operational accountability. Ultimate Guide to NHIs and the OWASP Non-Human Identity Top 10 both reflect the same reality: when identities span cloud and on-premises systems, ownership has to be explicit or it becomes ambiguous by default.
The accountability question matters because access review failures usually surface after misuse, not during approval. NHIMG research shows that 35.6% of organisations cite consistent access across hybrid and multi-cloud environments as their top NHI security challenge, which is a strong signal that the hard part is not policy wording but proving who accepted the risk. In practice, many security teams encounter this only after an audit finding or a privilege-related incident has already exposed the control gap.
How It Works in Practice
Accountability needs to be split by decision layer, not collapsed into one owner. The business owner should own the risk acceptance for the access request, the application owner should own the authorization model and its technical enforcement, and the identity team should own the workflow, evidence, and policy mechanics. That separation is consistent with governance thinking in the NIST Cybersecurity Framework 2.0, but there is no universal standard that maps every hybrid entitlement to a single role.
For over-provisioned access, strong practice is to require three things at approval time: a named requester, a named approver with authority, and a business justification that can survive later review. The workflow should preserve:
- who requested the access
- who approved it
- what resource was granted
- why the level exceeded least privilege
- when it will be reviewed or removed
This becomes especially important when one entitlement is federated across environments. A cloud role may map to an on-premises group, or a directory group may feed multiple applications through SSO. In those cases, the identity team can operate the process, but it cannot be the sole owner of the business decision. The application owner must validate whether the access is technically necessary, and the business owner must accept the risk of extra privilege. NHIMG’s NHI Lifecycle Management Guide is useful here because lifecycle ownership is what keeps approval, review, and revocation tied together across systems.
These controls tend to break down when entitlement data is fragmented across disconnected directories and manual spreadsheets because no single team can reliably prove the full approval chain.
Common Variations and Edge Cases
Tighter approval control often increases operational overhead, requiring organisations to balance speed against provable accountability. That tradeoff becomes sharper in mergers, shared service models, and legacy on-premises environments where access paths were never designed to support modern governance.
Current guidance suggests a few common variations. In highly regulated environments, the risk owner may need to be a separate control owner rather than the business manager. In platform teams, the application owner may be a service manager rather than a product owner. In outsourced operations, the approver may sit outside the technical team, but the accountable party should still be the enterprise function that can accept the risk.
The biggest edge case is inherited access. If a cloud role grants membership in an on-premises group, or a privileged directory group is reused across multiple systems, accountability should follow the source of the entitlement and the system that interprets it. That is where over-provisioning often persists unnoticed. The Top 10 NHI Issues highlights this kind of drift as a recurring problem, because the technical grant and the business justification rarely age at the same pace. The practical answer is periodic recertification with named owners, not shared ownership by default.
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.RM | Over-provisioning is a governance and risk-ownership problem across environments. |
| OWASP Non-Human Identity Top 10 | NHI-03 | Access sprawl and weak lifecycle control are core NHI failure modes. |
| NIST SP 800-63 | 6.1.2 | Identity proofing and lifecycle assurance support accountable access decisions. |
Assign named risk owners and require evidence for each approved entitlement.
Related resources from NHI Mgmt Group
- What breaks when access reviews are managed manually across ERP systems?
- How should security teams govern federated access across cloud and SaaS systems?
- How should security teams govern privileged access across cloud and legacy systems?
- How should security teams implement user access controls across cloud and on-prem systems?
