The handling of non-human credentials by people outside the intended automation path. It often appears as secrets in password stores, interactive shells, or manual troubleshooting, and it signals a boundary break between workload governance and human behaviour.
What Human Use of NHI Looks Like
Human use of NHI usually shows up when a person handles a non-human secret outside the system that is supposed to use it. Common examples include copying credentials into a password manager, pasting tokens into a shell for troubleshooting, or sharing access during a manual handoff.
This behaviour often appears harmless because it is motivated by speed or support work, but it changes the control model: a credential that was meant to be consumed by software is now exposed to human workflows, visibility gaps, and informal handling.
Why It Happens
People reach for NHI material when automation is incomplete, broken, or too slow to help. That can happen during incident response, integration debugging, break-glass support, or when a team has no clean way to inspect a workload without reusing its credentials.
It also happens when ownership is vague. If a service account, API key, or token has no clear steward, the easiest path is often the human path, even when that path bypasses the intended lifecycle and governance controls.
The problem is not simply that a person touched the secret. The deeper issue is that human handling usually breaks the assumptions behind machine identity design: limited audience, controlled rotation, automated use, and narrow privilege.
Why It Matters for Security
Human use of NHI can erase the boundary between operational access and identity governance. A secret copied into a chat thread, ticket, clipboard, or terminal session becomes easier to leak, harder to inventory, and more difficult to rotate with confidence.
That is why this pattern is closely tied to OWASP Non-Human Identity Top 10 and to NHIMG guidance on service account security, ownership and accountability, and the broader key NHI challenges and risks that arise when secrets are handled outside the intended automation path.
Once humans start using NHI material directly, you also lose a lot of the operational clarity that makes machine identity governance possible: who accessed it, why it was used, whether it should still exist, and whether the credential now needs to be considered exposed.
How to Recognize and Contain It
Look for signs such as service credentials appearing in password stores, long-lived tokens being copied into scripts, shared troubleshooting notes containing secrets, or repeated requests for direct secret access by operators who should be working through a controlled interface.
Containment usually begins with reducing the need for manual handling. Secrets should be discoverable, attributable, rotated, and scoped so that people do not need to reuse them just to keep systems running. Where human intervention is unavoidable, the access path should be explicit, temporary, and auditable.
The best reference point is often the difference between human and non-human identity itself, because that boundary explains why the same secret can be acceptable in one flow and risky in another. For practical navigation, NHIMG’s human vs non-human identity guide is especially useful when teams need to separate user behaviour from workload behaviour.
Risk and Threat Considerations
Human use of NHI is risky because it creates an exposure path that was not designed into the original credential model. A secret that enters a human workflow is easier to copy, harder to govern, and more likely to survive beyond its intended scope.
Failure mechanism: The control break usually happens when troubleshooting, shared access, or ad hoc support bypasses automation and exposes the secret to people, tools, or locations that were never meant to hold it.
Impact: That can lead to secret leakage, over-privilege persistence, token reuse, weak rotation discipline, and laterally useful credentials that survive long after the original operational need has passed.
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-10 — Human Use of NHI | Directly names human use of non-human identities as a top risk. |
| NHI-02 — Secret Leakage | Human handling often exposes NHI secrets through copying or sharing. | |
| Recommendation — Detect and eliminate human handling paths for non-human credentials. Prevent secrets from leaving controlled automation and vaulting paths. | ||
| NIST SP 800-53 Rev 5 | IA-5 — Authenticator Management | Covers lifecycle control for authenticators and other credential material. |
| IA-9 — Service Identification and Authentication | Applies to service and workload credentials that should not be human-operated. | |
| AC-6 — Least Privilege | Human use often signals access broader than the task requires. | |
| Recommendation — Manage credential issuance, storage, rotation, and revocation under strict lifecycle control. Use service-to-service authentication patterns that avoid direct human secret handling. Restrict human access paths to the minimum privileges needed for support tasks. | ||