User Pillar

Expanded Definition

The user pillar is the Zero Trust domain that governs how people and other requesting identities are authenticated, authorised, and continuously evaluated before access is granted. In NHI and IAM practice, it is not just login handling. It includes identity proofing, credential issuance, federation, session policy, access review, and revocation, all driven by current context rather than assumed trust.

Definitions vary across vendors when the term is stretched to cover every human access workflow, but in Zero Trust architecture the user pillar is narrower and more operational: it is the control plane for identity assertions and policy enforcement. That makes it closely related to NIST Cybersecurity Framework 2.0, especially identity and access governance functions, and to NHI governance when service accounts, API keys, and delegated identities inherit user-originated permissions.

The most common misapplication is treating the user pillar as a one-time authentication step, which occurs when teams equate sign-in success with ongoing trust.

Examples and Use Cases

Implementing the user pillar rigorously often introduces more policy checks and workflow friction, requiring organisations to weigh faster access against stronger assurance and better revocation discipline.

• A contractor receives time-bound access through federation, with policy re-evaluated at each session rather than granting standing trust.
• An administrator uses phishing-resistant authentication and step-up verification before elevated actions are allowed.
• Access to a production system is denied until identity attributes, device posture, and location align with policy intent.
• Onboarding and offboarding are tied to identity governance so that accounts, sessions, and entitlements are removed when employment or contract status changes.
• In NHI-heavy environments, a human approver grants temporary access to a workflow, but the underlying service account is still constrained by separate controls from the Ultimate Guide to NHIs and by identity policy guidance in NIST Cybersecurity Framework 2.0.

Across these cases, the user pillar acts as the enforcement layer that decides whether a request should proceed, pause, or be denied based on risk and policy.

Why It Matters in NHI Security

The user pillar matters because human access decisions often become the root cause of broader NHI exposure. When user identities are over-permissioned, improperly federated, or left active after role changes, the blast radius extends into service accounts, API keys, and delegated automation. NHIMG reports that 97% of NHIs carry excessive privileges, and that 90% of IT leaders say properly managing NHIs is essential for a successful zero-trust implementation, showing how tightly user governance and NHI control are linked.

This is where the user pillar intersects with secrets handling, privilege design, and lifecycle governance. If identity proofing is weak or access reviews are inconsistent, attackers can exploit legitimate user pathways to reach sensitive automation, vaults, and administrative consoles. The Ultimate Guide to NHIs highlights how widespread privilege excess and weak rotation practices undermine control, while NIST Cybersecurity Framework 2.0 reinforces the need for continuous access governance rather than static approval.

Organisations typically encounter the consequences after a compromised user session or failed offboarding event, at which point the user pillar becomes operationally unavoidable to address.

Related resources from NHI Mgmt Group

• When do service accounts become a higher risk than ordinary user accounts?
• How should security teams govern infrastructure identities alongside user identities?
• What is the difference between managing user accounts and managing NHIs?
• What is the difference between service account risk and user account risk in AD?