Start by mapping which identity decisions are still bound to proxy enforcement, server-side rules, or custom integrations. Then separate controls that genuinely need to remain central from those that should move into cloud-native orchestration, tenant-aware authorisation, or application-layer policy. Modernisation succeeds when governance becomes simpler, not when it merely shifts complexity elsewhere.
Why This Matters for Security Teams
Legacy access management was built for people logging in, not for service accounts, APIs, and autonomous software that act continuously across systems. That mismatch creates brittle proxy rules, server-side exceptions, and custom integrations that are hard to audit and even harder to retire. Modernisation is not a cosmetic control refresh. It is the shift from static entitlement thinking to identity decisions that reflect workload behaviour, business context, and real-time risk.
Current guidance in the OWASP Non-Human Identity Top 10 and the NIST Cybersecurity Framework 2.0 points to the same problem: identities must be governed across their full lifecycle, not just granted access once and left to drift. NHIMG research shows why that matters operationally, with Ultimate Guide to NHIs reporting that 97% of NHIs carry excessive privileges and 71% are not rotated within recommended time frames.
In practice, many security teams encounter privileged sprawl only after a secrets leak, service outage, or audit finding has already exposed how much access was being held together by exceptions rather than architecture.
How It Works in Practice
Modernisation starts by separating control planes. Keep centralised governance for policy, inventory, and assurance, but move decision-making closer to the application, the tenant, or the orchestration layer where the request context exists. That means replacing broad proxy enforcement with request-time authorisation, reducing long-lived shared secrets, and treating each workload as a distinct identity with its own cryptographic proof.
For most teams, the practical sequence is:
- Inventory where access is still mediated by proxies, legacy gateways, or hard-coded service credentials.
- Map each control to the layer that has the best context, such as platform policy, application logic, or cloud-native identity.
- Use short-lived credentials and automated rotation for workloads that do not need persistent access.
- Adopt workload identity patterns so the system can prove what the workload is, not just what secret it holds.
- Evaluate policy at runtime using current request attributes, tenant context, and risk signals.
This is where the lifecycle guidance in Ultimate Guide to NHIs — Lifecycle Processes for Managing NHIs and the risk analysis in Ultimate Guide to NHIs — Key Challenges and Risks become useful. They reinforce that modernisation is not just rotation or vaulting. It is a lifecycle redesign that removes standing access where possible and makes remaining access easier to inspect, revoke, and prove.
Best practice is evolving, but the direction is clear: policy-as-code, tenant-aware authorisation, and ephemeral credentials reduce the need for brittle “allow list plus exception” models. These controls tend to break down in highly distributed hybrid estates where application teams still depend on shared service principals, because context is fragmented across too many systems.
Common Variations and Edge Cases
Tighter access control often increases operational overhead, so organisations have to balance security gains against deployment friction and release velocity. That tradeoff is real, especially in mixed estates where some services are modern cloud workloads and others are embedded appliances or legacy platforms that cannot consume modern identity primitives.
There is no universal standard for this yet, but current guidance suggests treating exceptions as temporary migration states rather than durable architecture. For example, a proxy may still be justified for a legacy application that cannot evaluate policy itself, but the exception should be isolated, time-bounded, and tracked against a retirement plan. Likewise, not every workload can use the same token type or rotation cadence.
Teams should also distinguish between governance centralisation and access centralisation. Governance can stay central through inventory, policy, and attestation, while access decisions move into the application or orchestrator. That is the practical difference between modern control and legacy control, and it aligns with the visibility and lifecycle emphasis in Top 10 NHI Issues and the issue clustering in 52 NHI Breaches Analysis.
Modernisation also looks different for SaaS integrations, CI/CD runners, and AI-driven services. Some can move quickly to ephemeral identity and runtime policy. Others will require staged migration, compensating monitoring, and explicit decommissioning of old secrets before the legacy path becomes the default again.
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 | Legacy access management often hides unmanaged non-human identities. |
| NIST CSF 2.0 | PR.AC-4 | Modernisation depends on least-privilege access decisions at runtime. |
| NIST AI RMF | Autonomous workloads need risk-managed controls that adapt to context. |
Apply AI RMF governance to ensure dynamic authorisation and accountability for autonomous systems.
Related resources from NHI Mgmt Group
- How should security teams decide whether JIT access is safe for non-human identities?
- How can security teams reduce risk in legacy federated access paths?
- How should security teams reduce standing privilege in privileged access management?
- How should security teams inventory infrastructure for access management?
