Why do secrets and CI credentials behave like non-human identities?

Why This Matters for Security Teams

Secrets and CI credentials are often treated as deployment plumbing, but they function as machine-held identities with authority, scope, and lifecycle risk. When a token, key, or certificate can authenticate to repositories, pipelines, clouds, or production services, it becomes part of the trust boundary. That is why the OWASP Non-Human Identity Top 10 is useful here: it frames the operational reality that machine credentials can be over-privileged, overexposed, and poorly governed even when no human ever logs in with them.

The practical risk is not just theft. Long-lived secrets create hidden persistence, make incident scoping harder, and allow access to survive team changes, pipeline rebuilds, or application rewrites. In many environments, the real control failure is that no one can say who owns a secret, what it is allowed to reach, or when it should be revoked. Security teams that classify these values as static configuration usually miss the governance layer entirely.

In practice, many security teams encounter secret sprawl only after a leaked credential has already been reused across multiple systems, rather than through intentional identity governance.

How It Works in Practice

A useful mental model is to treat each secret or CI credential as a non-human identity with a purpose, privilege set, and lifecycle. That means assigning ownership, defining the workload or pipeline it serves, constraining where it can authenticate, and setting a clear expiry or rotation interval. The key question is not whether the secret is stored in a vault, but whether the associated access is measurable, revocable, and auditable across the systems that trust it.

In practice, controls should cover issuance, storage, use, rotation, and retirement. NIST guidance on identity and access management supports this approach by emphasizing authentication assurance, lifecycle management, and recovery processes in NIST SP 800-63 Digital Identity Guidelines, while NIST SP 800-53 Rev 5 Security and Privacy Controls provides the surrounding control structure for access enforcement, auditability, and configuration management. For CI/CD, that usually translates into:

• Short-lived credentials instead of static secrets where the platform supports it.
• Per-pipeline or per-workload identity rather than shared credentials across jobs.
• Secret scanning in source control, build logs, artifact repositories, and chat integrations.
• Central revocation paths so access can be removed without waiting for code changes.
• Rotation that is tied to usage and risk, not just a calendar reminder.

This approach also helps separate secret storage from secret authority. A vault can reduce exposure, but it does not by itself solve excessive privilege, unclear ownership, or stale access grants. Mature teams therefore track secrets the same way they track privileged accounts: who issued them, what they access, what telemetry proves usage, and what triggers revocation. These controls tend to break down in highly ephemeral build environments because short-lived runners, multi-stage pipelines, and third-party actions make ownership and runtime traceability difficult to preserve.

Common Variations and Edge Cases

Tighter secret governance often increases delivery overhead, requiring organisations to balance deployment speed against reduced exposure and clearer accountability. That tradeoff is especially visible in teams that rely on legacy CI systems, cross-account cloud access, or vendor integrations that cannot yet use federated workload identity. In those cases, best practice is evolving, and there is no universal standard for every platform, so the control objective should stay consistent even if the implementation differs.

For example, a long-lived API key used by a legacy build agent may still be necessary, but it should be isolated, monitored, and rotated more aggressively than a modern workload identity. Likewise, certificates can look different from tokens, yet they still behave like non-human identities when they confer authenticated access and outlive the task that uses them. The operational difference is in how they are provisioned and validated, not in whether they require governance.

The key exception is when a credential is truly transient and bound to a verified workload or session, with no reusable standing privilege. In that case, the secret is closer to an authentication artifact than a persistent identity. Even then, good practice is to keep ownership, expiry, and revocation explicit so the control model remains resilient as architecture changes.

Related resources from NHI Mgmt Group

• Why do CI tokens behave like privileged non-human identities?
• What is the difference between secrets rotation and access control for non-human identities?
• Should organisations treat SaaS integrations like non-human identities?
• Should organisations treat certificates and tokens like other non-human identities?