A non-human identity that acts on behalf of an organisation or another system with defined authority. In agentic environments, this identity may chain actions across tools and services, so lifecycle, approval, and revocation need to reflect the delegation path as well as the technical account itself.
Expanded Definition
Delegated machine identity is a machine or service identity that is authorised to act for another identity, system, or organisation within a defined scope. In NHI governance, the delegation path matters as much as the credential itself because the identity may inherit permissions, invoke tools, and trigger downstream actions across multiple systems. That makes it different from a simple service account, which is often treated as an isolated technical principal.
Definitions vary across vendors, but the operational issue is consistent: delegation creates a chain of trust that must be explicit, time-bound, and revocable. In agentic environments, this concept overlaps with workload identity, service identity, and AI agent execution authority, so organisations should anchor the model to policy rather than naming conventions. For broader NHI context, see Ultimate Guide to NHIs and the NIST Cybersecurity Framework 2.0 for identity governance alignment.
The most common misapplication is treating delegated machine identity as a static account, which occurs when teams ignore who granted authority, what the identity can reach, and when that authority should expire.
Examples and Use Cases
Implementing delegated machine identity rigorously often introduces tighter approval and revocation workflows, requiring organisations to weigh operational speed against the risk of uncontrolled onward access.
- An AI agent uses a delegated identity to open tickets, query a knowledge base, and update a CMDB, but only within a single business unit and for a limited time window.
- A CI/CD pipeline assumes delegated access to deploy containers into a production cluster, with the delegation tied to a signed release and a short-lived token.
- A workload identity retrieves secrets from a vault on behalf of an application, but the vault policy records the parent system, the approving team, and the expiration condition.
- A partner integration receives delegated API access to submit events into an internal workflow engine, with monitoring linked to the external organisation that sponsored the delegation.
- A support automation bot acts for an incident-response team to collect logs and quarantine a host, while privileged steps require explicit step-up approval.
These patterns are easier to govern when teams define the delegation chain up front, as described in the Ultimate Guide to NHIs — What are Non-Human Identities, and then map technical access to the principle of least privilege in the NIST Cybersecurity Framework 2.0. The practical challenge is proving that the delegated identity never exceeds the authority it was given.
Why It Matters in NHI Security
Delegated machine identities are high-risk because failures rarely appear as a single broken login. They surface as overbroad access, hidden transitive trust, stale approvals, or actions taken long after the sponsoring system has changed. That is why NHI governance must track ownership, purpose, expiry, and revocation together. NHIMG research shows that 59% of companies face greater difficulties auditing machine identities due to lack of clear ownership and limited visibility, a problem that becomes more severe when delegation chains are undocumented. The same research also shows that 53% of organisations have experienced a security incident directly related to machine identity management failures.
In practice, delegated authority can outlive the business need that created it, especially in automation-heavy environments where tokens and certificates are reused across workflows. Guidance in the Critical Gaps in Machine Identity Management report reinforces that manual tracking does not scale, and the Top 10 NHI Issues highlights how hidden ownership and poor lifecycle controls amplify exposure. Organisations typically encounter delegated machine identity risk only after an incident review, at which point the delegation chain becomes operationally unavoidable to address.
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 Zero Trust (SP 800-207) set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-01 | Delegation is central to NHI trust boundaries, ownership, and lifecycle control. |
| NIST CSF 2.0 | PR.AC-4 | Least-privilege access and identity governance apply directly to delegated machine access. |
| NIST Zero Trust (SP 800-207) | Zero Trust requires each delegated action to be continuously authorised, not implicitly trusted. |
Treat every delegated machine action as independently verifiable and enforce short-lived, scoped credentials.
Related resources from NHI Mgmt Group
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on June 24, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
