Security teams should move CLI tools to delegated authentication with browser-based OAuth flows, short-lived tokens, and PKCE. That reduces secret sprawl and makes revocation more practical. The important control is not the login screen alone, but whether the resulting token is narrowly scoped, auditable, and tied to a lifecycle-managed identity path.
Why This Matters for Security Teams
api key in command-line tools are attractive because they are easy to script, but they fail the moment a tool spreads beyond the original user, workstation, or workflow. A single static key can end up in shell history, dotfiles, CI logs, ticketing systems, or shared automation. That is why the better question is not how to store the key more carefully, but how to replace the key with an identity path that can be issued, scoped, monitored, and revoked per session. NIST Cybersecurity Framework 2.0 is useful here because it pushes teams toward lifecycle-aware governance rather than one-time issuance. NHIMG research on the Guide to the Secret Sprawl Challenge shows why detection alone is insufficient when credentials keep moving through everyday developer workflows.
This matters even more for command-line tooling because the attack surface is operational, not theoretical. A compromised laptop, a copied config file, or an over-scoped automation token can expose production systems long after the original user has left. In practice, many security teams discover API key sprawl only after a leaked key has already been reused across scripts, pipelines, and support tooling.
How It Works in Practice
The replacement pattern is delegated authentication: the CLI tool no longer carries a long-lived API key, but instead obtains a short-lived token through an interactive browser-based OAuth flow, typically with PKCE. That token should be narrowly scoped to the specific task, bound to the current user or workload identity, and rotated or revoked automatically when the session ends. This is the practical difference between a secret that can be copied indefinitely and an identity assertion that expires quickly.
For teams that operate at scale, the right model is usually a combination of user identity and workload identity. Human operators authenticate through an SSO-backed browser flow. Automation uses a workload identity primitive such as OIDC-based federation or SPIFFE-style identity, so the tool can prove what it is without embedding static secrets. That approach aligns with current guidance in NIST Cybersecurity Framework 2.0 and with the operational lessons documented in NHIMG coverage of the BeyondTrust API key breach, where exposed credentials became a durable access path rather than a temporary login artifact.
- Use browser-based OAuth with PKCE for interactive CLI logins.
- Issue short-lived access tokens, not reusable API keys.
- Bind tokens to least privilege scopes and explicit tool actions.
- Prefer automated revocation and refresh over manual key rotation.
- Separate human operator sessions from machine-to-machine execution.
Where possible, centralise token minting behind an identity broker so revocation, logging, and conditional access policies apply consistently across tools. This also improves auditability because the access event is tied to a named identity and a specific action, rather than a shared secret reused by many scripts. These controls tend to break down when legacy CLIs cannot support browser flows or when offline workflows require unattended access without a federated identity provider.
Common Variations and Edge Cases
Tighter authentication often increases friction, so organisations must balance security with developer usability and automation reliability. In practice, that means some environments will need a hybrid transition period where API keys exist only as tightly governed exceptions, not as the default pattern. Best practice is evolving, but the direction is clear: static credentials should be the exception for break-glass use, not the normal operating model.
There are a few common exceptions. Headless build agents may need device-code flows or workload federation instead of browser-based login. Air-gapped or offline environments may require locally brokered short-lived credentials with strict TTL enforcement. Shared service accounts should be phased out where possible because they obscure attribution and make revocation ambiguous. NHIMG’s State of Non-Human Identity Security report underscores why this matters operationally: 85% of organisations lack full visibility into third-party vendors connected via OAuth apps, which means delegated access can also become hidden access if it is not governed well.
Teams should also avoid assuming that OAuth alone solves the problem. Without scope minimisation, token lifetime limits, device posture checks, and clear ownership of the issuing identity lifecycle, a browser flow can simply replace one durable secret with another durable token. Current guidance suggests treating every CLI token as a managed NHI artifact, with the same controls used for other machine identities.
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 and OWASP Agentic AI Top 10 address the attack and risk surface, while NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-03 | Covers secret rotation and replacement of static credentials in tools. |
| OWASP Agentic AI Top 10 | A-02 | CLI tools can act autonomously, so runtime authorization and scoped tokens matter. |
| NIST CSF 2.0 | PR.AC-1 | Identity proofing and access control apply to delegated CLI authentication. |
Replace API keys with short-lived, revocable credentials and enforce automated rotation where exceptions remain.
