A token, key, or other secret that allows one system to act on behalf of another identity. For agentic environments, delegated credentials matter because they extend trust into runtime, where the agent can use them to reach tools, data, or services without a fresh human approval.
Expanded Definition
A delegated credential is a secret or token that lets one identity act with limited authority on behalf of another. In NHI and agentic AI environments, that authority may be passed to a service account, workload, or autonomous agent so it can call APIs, reach data, or complete a task without a human in the loop.
Definitions vary across vendors, but the security distinction is consistent: delegation is not ownership. The original identity may remain the source of trust, while the delegated credential becomes the runtime proof used by the recipient. That makes scoping, expiry, audience restriction, and revocation central design choices. The NIST SP 800-63 Digital Identity Guidelines help frame how assurance and credential handling should be treated when an identity assertion is transferred into a new context, while the OWASP OWASP Non-Human Identity Top 10 highlights why workload credentials need stronger lifecycle control than human-facing access.
The most common misapplication is treating a delegated credential like a static shared secret, which occurs when teams reuse it across tools or leave it valid long after the original task or session has ended.
Examples and Use Cases
Implementing delegated credentials rigorously often introduces tighter expiry, token exchange logic, and audit overhead, requiring organisations to weigh automation speed against reduced blast radius.
- An AI agent receives a short-lived token to query an internal ticketing API, then loses access automatically when the workflow completes.
- A CI/CD pipeline exchanges its own workload identity for a narrower credential that can publish artifacts but cannot read production databases, echoing patterns discussed in the CI/CD pipeline exploitation case study.
- A support automation agent uses delegated access to retrieve customer context from a CRM, but only within a specific tenant and only for a limited time window.
- A cloud function obtains a delegated credential after a policy decision, then calls storage or messaging services without embedding any long-lived API key, a practice aligned with Ultimate Guide to NHIs — Static vs Dynamic Secrets.
- An incident response bot is granted read-only access during containment, then its authority is withdrawn once the task is closed.
For implementation guidance, the NIST SP 800-63 Digital Identity Guidelines and identity federation patterns are useful references for thinking about assertion strength, but organisations should still tailor delegation rules to workload risk and tool boundaries.
Why It Matters in NHI Security
Delegated credentials become dangerous when they outlive the context that justified them. A stolen token can act like a borrowed key, letting an attacker move laterally, harvest data, or invoke privileged tools as if they were the trusted delegate. That is why delegated access is closely tied to secret sprawl, session control, and Zero Standing Privilege. It also intersects with the operational reality captured in NHIMG research: 59.8% of organisations see value in dynamic ephemeral credentials, yet 23.7% still share secrets through insecure methods such as email or messaging applications, according to The 2024 Non-Human Identity Security Report.
Delegation should be built around narrow scopes, short lifetimes, and revocation hooks, not around convenience. The Guide to the Secret Sprawl Challenge shows how quickly secrets accumulate when teams bypass lifecycle discipline, and the 230M AWS environment compromise illustrates the scale that credential misuse can reach when cloud access is not tightly bounded.
Organisations typically encounter the true cost of delegated credentials only after a token is replayed, a pipeline is abused, or an agent makes an unauthorised call, at which point delegated access 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 SP 800-63 and NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-63 | Covers digital identity assurance and credential handling concepts used in delegation. | |
| OWASP Non-Human Identity Top 10 | NHI-02 | Addresses secret lifecycle risks for non-human identities and delegated access tokens. |
| NIST CSF 2.0 | PR.AC-4 | Maps to access enforcement and least-privilege control over delegated authority. |
Treat delegated credentials as assurance-bound artifacts and limit them to the minimum valid context.
