Delegation credentials are credentials that let one identity act on behalf of another identity. They are used in federated access, service-to-service calls and delegated administration, and are usually constrained by scope, expiry and approval so the acting party cannot exceed the delegated rights.
What Delegation Credentials Are
Delegation credentials are a controlled way for one identity to act on behalf of another, so the delegated party can perform approved actions without inheriting the full authority of the original identity.
This pattern matters because delegation is not the same as shared access. A well-designed delegation credential should be narrow, time-bound and traceable, with explicit limits on what the actor can do and for how long.
Where Delegation Credentials Appear
Delegation credentials show up in federated access, service-to-service calls, token exchange flows and delegated administration. They are the mechanism that makes “act for me” possible without handing over the primary credential itself.
In practice, these credentials may be implemented as bearer tokens, exchanged tokens, scoped grants or other credential forms that carry constrained authority. The key design question is always whether the delegated credential represents the minimum necessary rights for the task.
Why Scope, Expiry and Approval Matter
The security value of delegation credentials comes from constraint. Scope limits what the delegated party can reach, expiry limits how long the authority exists, and approval creates an explicit governance checkpoint before delegation is granted.
Those constraints reduce the blast radius if the delegated credential is stolen, misused or misrouted. They also help preserve accountability, because the original identity remains the root of authority while the delegated credential acts as a bounded proxy.
Delegation becomes dangerous when the credential outlives the need, can be reused too broadly or is issued without a clear trust decision. At that point, the delegated path starts to behave like standing access rather than temporary authority.
How Delegation Credentials Differ From Ordinary Credentials
Ordinary credentials usually establish direct access for the authenticating identity. Delegation credentials instead express a relationship, one identity is authorised to operate within the guardrails of another identity’s approved authority.
That distinction is important for auditing and for access design. The organisation needs to know who requested delegation, who approved it, what rights were delegated, and what downstream systems must recognise the delegation signal correctly.
Risk and Threat Considerations
Delegation credentials create a high-value abuse path because they can convert one valid identity into a proxy for another. If scope, expiry or approval controls are weak, an attacker or careless operator can turn a legitimate delegation into overreach, persistence or lateral movement.
Failure mechanism: The delegated credential is issued too broadly, reused beyond its intended purpose, or accepted by downstream systems without enforcing the original constraints, which allows the acting party to exceed authorised bounds.
Impact: Compromise can expose upstream privileges, sensitive data, administrative functions, or service actions that were never meant to be directly available to the delegated actor.
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 sets the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-04 — Insecure Authentication | Delegation credentials depend on constrained, verified token handling and on-behalf-of trust. |
| NHI-05 — Overprivileged NHI | Delegation credentials are dangerous when the delegated authority is broader than the task. | |
| NHI-07 — Long-Lived Secrets | Delegation credentials become riskier when their lifetime is longer than the business need. | |
| Recommendation — Enforce constrained delegation flows so acting identities cannot exceed approved authority. Limit delegated credentials to the minimum rights needed for the delegated action. Set short expiry and rotate or revoke delegation credentials as soon as the task ends. | ||
| NIST SP 800-53 Rev 5 | IA-9 — Service Identification and Authentication | Delegation credentials often secure service-to-service and on-behalf-of access paths. |
| AC-6 — Least Privilege | Delegation credentials should carry only the minimal authority needed for the delegated task. | |
| IA-5 — Authenticator Management | Delegation credentials require lifecycle controls for issuance, expiry, rotation and revocation. | |
| Recommendation — Apply IA-9 to authenticate services that present delegated credentials on behalf of others. Constrain delegated access to the least privilege required for the approved function. Manage delegated credentials through controlled issuance, expiry, rotation and revocation. | ||
Practitioner Guidance
What to watch for: Treat delegation as a lifecycle control, not just an authentication mechanism. The practical question is whether every delegated credential is tied to a clear business purpose, a short lifetime, and a revocation path that works when the underlying trust relationship changes.
Governance implication: Organisations should be able to explain and review who may delegate, which rights may be passed through, and how downstream systems verify that delegated authority has not drifted beyond the approved scope.