Governance breaks because the access object outlives the user review cycle. Tokens can remain valid in code, pipelines, and integrations after the human account changes, so directory-based certification misses the real entry path. The result is invisible standing access that is harder to attribute and revoke than a normal user role.
What breaks when user-review logic is applied to machine access?
The first thing that breaks is the governance model itself. A token or key is not a person, so it does not follow a normal joiner-mover-leaver rhythm, and it may keep authenticating long after the original human context has changed. That means the access path can remain active in code, CI/CD, and integrations even when the directory record looks clean.
When that happens, review becomes misaligned with reality. A manager can certify a user role, yet the actual entry point is still a bearer token in a pipeline variable or application configuration. That gap is why machine access needs its own lifecycle, ownership, and revocation logic rather than being folded into ordinary user entitlement review.
In practice, this is the difference between reviewing who a person is and reviewing what can still act. API keys and OAuth tokens can be reused by services, scripts, and third-party integrations without any visible sign in the user account workflow, so the real control object is the credentialed pathway, not the human identity that once created it. See API Key Management Guide for the lifecycle controls that treat keys as governed assets rather than user badges.
Why does invisibility matter more than convenience here?
Because invisible standing access is much harder to attribute, scope, and revoke than a normal user role. If the token is embedded in a build, app, or partner integration, the organization may not know all the places it exists, which means certification can approve the wrong object while the real access path remains live.
That also changes blast radius. A user account can be disabled centrally, but a long-lived token may continue to work until it is explicitly rotated or invalidated. If the token has broad scopes or sits in a production pipeline, the business impact can extend far beyond the original person’s employment or access status.
NHIMG’s Ultimate Guide to NHIs — What are Non-Human Identities is useful here because it frames these artifacts as identities with their own governance, not as incidental secrets attached to a person. Guide to the Secret Sprawl Challenge adds the operational reality: once keys and tokens spread into code and pipelines, inventory and cleanup become a control problem, not just a policy problem.
OAuth itself is designed for delegated access, so the security question is not whether a token can act, but whether it can still act safely in the right place and for the right duration. The RFC 6749 OAuth 2.0 Authorization Framework defines that delegation model, which is exactly why expiry, audience restriction, and revocation become central when the token outlives the human review cycle.
Which control assumptions stop working?
Directory-centric review assumes the human account is the meaningful unit of control. Once tokens and API keys are treated like ordinary credentials, that assumption fails, because the operational object may be a secret stored outside the directory, a client credential in a service, or an OAuth grant embedded in an integration.
It also weakens segregation of duties. A user can change jobs, leave the company, or lose a role, yet the token may still have the old access profile. The control that should be measured is not only who approved the user, but whether every credential derived from that user or integration was discovered, owned, and retired on time.
The practical answer is to align review with the credential lifecycle and the system boundary where the token actually lives. Guide to NHI Rotation Challenges is relevant because rotation is the point where stale standing access is forced to reveal itself. For broader context, OWASP Non-Human Identity Top 10 captures the governance failures that appear when machine-held credentials are left outside normal access controls.
Risk and Threat Considerations
The risk is that the organization certifies the wrong asset and leaves the real access path untouched. Attackers benefit from this because a stale API key or OAuth token can provide quiet persistence, especially when it is buried in code, automation, or a third-party integration that no one revisits during a user review cycle.
Failure mechanism: A human-centric review process misses bearer credentials that still authenticate independently of the user account, so the token remains valid after role changes, termination, or offboarding.
Impact: Standing access becomes hard to detect, hard to attribute, and hard to revoke, which increases the chance of unauthorized use, lateral access through integrations, and delayed containment after compromise.
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 API Security Top 10 address 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-07 — Long-Lived Secrets | Long-lived tokens outliving user review cycles create stale standing access. |
| NHI-01 — Improper Offboarding | Offboarding misses machine-held tokens when only the human account is reviewed. | |
| NHI-05 — Overprivileged NHI | Treating tokens like user creds often leaves broader access than needed. | |
| Recommendation — Shorten token lifetime and enforce rotation and revocation on a fixed schedule. Ensure revocation workflows remove every credential tied to the departing user or integration. Scope tokens to the minimum resource and operation set required. | ||
| OWASP API Security Top 10 | API2 — Broken Authentication | Bearer tokens and API keys create authentication risk when governance misses them. |
| Recommendation — Harden token issuance, expiry, and revocation to prevent unauthorized reuse. | ||
| NIST SP 800-53 Rev 5 | IA-5 — Authenticator Management | API keys and OAuth tokens need lifecycle control distinct from user review. |
| Recommendation — Manage issuance, storage, rotation, revocation, and expiration for all authenticators. | ||
Practitioner Guidance
What to prioritise: Treat every API key and OAuth token as an independently owned access object with its own expiry, scope, and revocation path. If you cannot point to the system owner, issuing event, and last rotation date, the control is incomplete.
What to verify: Check whether certification evidence covers the actual credential location, not just the user record. In many environments the decisive evidence is inventory of secrets in repositories, pipelines, vaults, and SaaS integrations, plus proof that revoked human access also triggered token cleanup.
Decision rule: If the credential can still authenticate a production system, prioritize rotation and blast-radius assessment before debating whether the associated user role is still appropriate.
Practitioner takeaway: The key mistake is confusing provenance with authority, because a token can inherit a person’s origin but still outlive their governance.
Related resources from NHI Mgmt Group
- What breaks when AI gateway controls are treated like ordinary API security?
- What breaks when tokens are treated like static credentials?
- What breaks when infrastructure still relies on long lived passwords, API keys, and OAuth tokens?
- What breaks when private keys are treated like ordinary application data in infrastructure systems?