Identity delegation is the controlled act of allowing one identity to act on behalf of another. In IAM, it lets a human, service account, or AI agent use approved permissions without sharing credentials, while preserving accountability, least privilege, and audit trails through scoped authorization, delegation policy, and revocation controls.
What Identity Delegation Means in Practice
Identity delegation is not the same as credential sharing. The delegating identity retains ownership of the original authority, while the delegate receives a scoped, temporary right to act, usually under explicit policy and auditability constraints.
That distinction matters because delegation is meant to preserve accountability. A well-designed delegation model should make it clear who approved the handoff, what actions were allowed, how long the permission lasted, and how the arrangement can be revoked.
Where Delegation Shows Up
Delegation appears in workforce IAM, service-to-service workflows, and AI-assisted operations. A user may approve another person to perform a task on their behalf, a service account may call downstream systems using constrained authority, or an AI agent may be granted a limited token or on-behalf-of flow to complete a defined action.
In mature environments, delegation is usually narrower than full impersonation. The goal is to avoid giving the delegate the original identity’s standing access, especially when the action is narrow, time-bound, or context-specific.
Security Properties That Make Delegation Safe
Delegation only works as a control when it is bounded by least privilege, explicit scope, and revocation. Those properties reduce the chance that a helper identity becomes a durable backdoor or that an approval chain turns into broad, undocumented access.
It also needs strong traceability. Audit logs should show both the original identity and the acting delegate, because investigations often depend on understanding whether an action was direct, approved, or indirectly authorized through a delegation path.
For identity-heavy organisations, delegation often connects to lifecycle governance, access review, and credential hygiene. NHIMG’s NHI Lifecycle Management Guide is useful here because delegation decisions often depend on how well identities, permissions, and revocation are managed over time.
Delegation, Trust Boundaries, and Control Design
Good delegation design separates authority from possession. A delegate should be able to act only because the system recognises an approved relationship, not because a shared secret was copied or a broad role was inherited without review.
That is why delegation policy, consent flow, token scope, expiry, and revocation are all part of the control surface. If any one of those fails, delegation can drift into over-privilege, hidden impersonation, or uncontrolled reuse of authority.
For broader identity governance context, the Ultimate Guide to NHIs, Regulatory and Audit Perspectives helps frame why delegated access needs clear ownership and evidence, while the Ultimate Guide to NHIs, Standards connects delegation to modern identity and trust controls such as least privilege and zero trust.
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 addresses the attack and risk surface, while NIST SP 800-53 Rev 5 and NIST Zero Trust (SP 800-207) set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | AC-6 — Least Privilege | Delegation must constrain what the acting identity can do. |
| IA-5 — Authenticator Management | Delegation depends on protected credentials, tokens, and revocation. | |
| AU-2 — Event Logging | Delegation needs auditable records of who approved and who acted. | |
| Recommendation — Limit delegated authority to the minimum actions required. Manage delegated credentials and revoke them promptly when no longer needed. Log delegated actions with actor, approver, scope, and time context. | ||
| NIST Zero Trust (SP 800-207) | Continuous Verification and Least Privilege | Delegation fits zero trust when authority is explicitly scoped and continually validated. |
| Recommendation — Apply continuous verification to delegated access and restrict it to task-specific use. | ||
| OWASP Non-Human Identity Top 10 | NHI-05 — Overprivileged NHI | Delegated non-human access can become overprivileged when scope is too broad. |
| Recommendation — Constrain delegated non-human authority to the smallest workable permission set. | ||
Practitioner Guidance
Why practitioners should care: Delegation is often where accountability problems begin, because the original actor, the delegate, and the approving system can all look valid unless the control model is deliberately explicit. Treat delegation as a governed authority transfer, not as a convenience feature.
Governance implication: A delegation policy should define who can grant authority, what can be delegated, how long the delegation lasts, and what evidence must remain in the audit trail. Without those rules, teams often end up with informal impersonation paths that are hard to review or revoke.
What to watch for: Broad delegation scopes, long-lived approvals, and reuse across workflows are strong signs that a system is drifting away from controlled delegation and toward standing privilege. That is usually where the security value begins to degrade.