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19/08/2026 3:27 pm
TL;DR: Authorization models are only effective when matched to the right operating context, and Nexis frames RBAC, ABAC and PBAC as complementary approaches rather than universal answers. The governance challenge is not selecting a winner, but maintaining fit-for-purpose controls as business rules, risk appetite and review cycles change over time.
NHIMG editorial — here’s why we think this discussion matters
By the numbers:
- 69% of organisations now have more machine identities than human ones.
- 72% of identity professionals find machine identities more challenging to manage than human identities, citing poor internal processes and insufficient tooling.
Questions worth separating out
Q: How should security teams decide between RBAC, ABAC, and PBAC?
A: Start with the stability of the access pattern.
Q: Why do identity governance controls matter for non-human identities too?
A: Non-human identities can outlive the project, workload, or vendor relationship that created them.
Practitioner guidance
- Define authorization by use case, not by fashion Map each application or service to the simplest model that can express its required access decisions without losing auditability.
- Externalize policy where change is frequent Move fine-grained decision logic out of application code when access rules change often or must be reused across systems.
- Review access by lifecycle event Link authorization recertification to joiner, mover, leaver events, application changes and service-account ownership changes.
What to expect at the briefing
Nexis's full webinar preview covers the operational discussion this post intentionally leaves at the governance level:
- Panel perspectives on when RBAC remains sufficient and when ABAC or PBAC becomes operationally preferable
- Practical discussion of how authorization models are reviewed and adapted over their lifecycle
- Moderated exchange on zero trust, externalized authorization and fine-grained authorization in enterprise settings
- Real-world implementation context from IAM and cybersecurity practitioners working in regulated environments
👉 Register for Nexis's live webinar on RBAC, ABAC and PBAC fit-for-purpose authorization →
Authorization models in practice: when do RBAC, ABAC and PBAC fit?
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19/08/2026 4:11 pm
Fit-for-purpose authorization is a governance problem before it is a technical one. RBAC, ABAC and PBAC are not competing religions. They are different answers to different control problems, and the wrong answer usually fails because the organisation cannot maintain the model at scale. For IAM leaders, the real question is whether the decision model remains reviewable as the enterprise grows more dynamic.
A few things that frame the scale:
- 1 in 4 organisations are already investing in dedicated NHI security capabilities, with an additional 60% planning to do so within the next twelve months, according to The State of Non-Human Identity Security.
- Only 38% have automated certificate lifecycle management in place, according to The Critical Gaps in Machine Identity Management report.
A question worth separating out:
Q: How do teams keep policy-based authorization auditable?
A: Keep policy ownership, versioning and test evidence in one governed process, and review changes alongside application and data changes. Decision logic should be explainable to auditors and reviewers, with clear linkage between policy intent, policy inputs and the final access outcome.
👉 Read our full editorial: Modern authorization models: choosing RBAC, ABAC and PBAC fit
