Start by separating interactive human logins from machine automation. Replace shared keys in user workflows with per-user authentication, then keep API keys only for non-interactive service contexts where attribution is not required. That reduces standing secret exposure and makes revocation and audit trails much more reliable.
Split human CLI use from machine automation first
The first move is to stop treating interactive logins and automation as the same access pattern. CLI sessions used by people should move to per-user authentication so actions are attributable, while shared API keys should be reserved for non-interactive service contexts where a human identity is not the right control boundary.
That separation matters because a shared key in a human workflow hides who actually acted, makes revocation coarse, and turns one exposed secret into a broad access path. The right first step is usually an access-model reset, not a rotation event.
When teams keep a single shared key across scripts, terminals, and support workflows, they create a permanent shared secret with no meaningful attribution. Moving human use to per-user auth lets you preserve accountability while reducing the number of places a long-lived secret can leak.
What “replace” means in practice
Replacing shared keys does not mean eliminating every API key immediately. It means deciding whether the caller is a person or automation, then issuing the right credential type for that caller. People should authenticate through a personal identity flow, and machines should use a service credential that can be scoped, rotated, and revoked without affecting every operator.
For human CLI access, the cleaner pattern is a user-backed identity flow, such as browser-based sign-in, federated login, or a short-lived token exchange. For automation, keep the key only where the system is truly non-interactive and attribution is not the operational goal.
This is also the point where teams should inspect whether the API key is doing too much work. If it is being used for convenience, shell reuse, or ad hoc admin actions, it is already functioning as a human login substitute, which is the wrong role for a shared secret.
Why the first change should focus on attribution and secret exposure
The biggest gain from this change is not only stronger authentication, it is better control of the blast radius. Per-user authentication makes revocation precise, simplifies access reviews, and avoids the common failure mode where one shared key survives long after the original purpose changed.
That is especially important when the same credential appears in multiple environments or across a team. If the key leaks, every workflow that depends on it becomes suspect at once. If each person authenticates individually, you can isolate the problem quickly and preserve legitimate automation paths.
Strong secret hygiene starts with reducing standing shared exposure, then narrowing privileges. A good starting resource on API key management is useful here because it separates creation, scoping, rotation, and revocation into distinct decisions rather than treating all keys as interchangeable.
Risk and Threat Considerations
Shared API keys in CLI workflows create a high-value target because they can be copied, reused, and embedded in scripts without visible ownership. Once one of those keys is exposed, attackers do not need a password reset path, they only need a valid secret that still works.
Failure mechanism: The access path stays tied to a bearer secret instead of a named user, so anyone who obtains the key can impersonate the workflow, and defenders lose the ability to distinguish legitimate operator action from misuse.
Impact: Exposure can lead to unauthorized command execution, difficult-to-trace administrative changes, and delayed revocation because teams often hesitate to break a shared process while they identify every place the key is embedded.
Industry guidance on human-facing authentication increasingly favours stronger, user-specific login flows, as reflected in NIST SP 800-63 Digital Identity Guidelines. For API-specific misuse patterns, the OWASP API Security Top 10 is a useful companion when teams need to separate broken user access from machine-only authorization.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP API Security Top 10 addresses the attack and risk surface, while NIST SP 800-63 and NIST SP 800-53 Rev 5 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-63 | Digital Identity Guidelines | Per-user CLI login should use stronger user authentication than a shared key. |
| Recommendation — Adopt user-backed authentication for interactive CLI access and reserve shared secrets for non-interactive services. | ||
| OWASP API Security Top 10 | API2 — Broken Authentication | Shared CLI keys used by humans are an authentication weakness that obscures identity and revocation. |
| API8 — Security Misconfiguration | Using one shared key for both users and automation is an access-control design flaw. | |
| Recommendation — Replace shared human keys with individual authentication and short-lived credentials. Separate user and service access paths so each can be governed and revoked independently. | ||
| NIST SP 800-53 Rev 5 | IA-5 — Authenticator Management | The question is about replacing and governing shared API keys as authenticators. |
| IA-2 — Identification and Authentication (Organizational Users) | Interactive human CLI access should authenticate as named users, not shared accounts. | |
| Recommendation — Manage credentials with unique issuance, rotation, and revocation instead of shared reuse. Authenticate users individually for CLI actions that require accountability. | ||
Practitioner Guidance
What to prioritise: Inventory every CLI path that accepts a shared key and classify it as human use or automation use. If a person types it, pastes it, or stores it in a personal config file, it should be treated as a user login problem, not an API integration problem.
Decision rule: If the credential is needed by an operator, replace it with per-user authentication first; if it is needed by a daemon, pipeline, or scheduled job, keep it machine-scoped and remove human dependence on that same secret.
What to verify: Confirm that revocation of one user does not break unrelated automation, and that audit logs can show which human or service actually initiated each action. If you cannot produce that evidence, the access design is still too shared.
Practitioner takeaway: The cleanest first step is to separate attribution from automation, because once human CLI use stops depending on a shared secret, everything else, rotation, revocation, auditability, becomes much easier to do correctly.
Related resources from NHI Mgmt Group
- What should IAM teams do when a tool ecosystem still relies on API keys?
- How should security teams choose between API keys, Device Flow, and Client Credentials for CLI apps?
- How should security teams replace API keys in service-to-service authentication?
- How should security teams govern AI observability tools that use API keys and CLI automation?