Treat them as related but different control domains. Human identities need authentication, session, and review controls, while NHIs need inventory, ownership, rotation, and revocation controls. A unified governance programme should use one policy framework and one evidence model, but separate operational rules for how access is granted, monitored, and removed.
Why This Matters for Security Teams
Governing human identities and NHIs together matters because attackers rarely respect organisational silos. Human accounts, service accounts, API keys, certificates, and machine tokens often share the same applications, logs, ticketing systems, and approval paths. That makes weak human identity hygiene a risk multiplier for NHIs, and vice versa. NHI Mgmt Group research shows NHIs outnumber human identities by 25x to 50x in modern enterprises, which means the machine side of identity governance is usually the larger operational burden. The practical answer is to use one policy language and one evidence model, while still applying different operating rules for sessions, rotation, revocation, and review. For broader governance context, align the programme to NIST Cybersecurity Framework 2.0 and the identity lifecycle guidance in Ultimate Guide to NHIs. In practice, many security teams encounter uncontrolled machine access only after a leak, an offboarding failure, or an audit exception has already exposed the gap.
How It Works in Practice
Start by defining governance at two levels. At the policy level, humans and NHIs should sit under the same enterprise identity standard, with common requirements for ownership, approval, logging, and exception handling. At the operational level, separate the control logic: humans need strong authentication, session timeouts, periodic recertification, and role reviews; NHIs need inventory, workload ownership, credential rotation, secret storage rules, and automated revocation on change or shutdown.
The key is to map each NHI to a business service and a named owner, then force that owner into the same review cadence used for privileged human access. This is especially important when secrets live in CI/CD, code repos, or multiple vaults. NHI Mgmt Group notes that 96% of organisations store secrets outside secrets managers and 73% of vaults are misconfigured, which is why governance has to include evidence of location, age, and rotation status. For a practical identity baseline, see Top 10 NHI Issues and Ultimate Guide to NHIs — Lifecycle Processes for Managing NHIs. For policy mapping, many teams use NIST Cybersecurity Framework 2.0 to tie identity, protect, detect, and recover activities together.
- Maintain one inventory with two classes: human identities and NHIs.
- Assign every NHI to an application, pipeline, or autonomous workload owner.
- Track issuance, rotation, last use, and revocation as mandatory evidence.
- Use the same exception process for risky human access and long-lived machine credentials.
These controls tend to break down when identities are embedded in code-heavy delivery pipelines because ownership, change control, and secret sprawl become difficult to reconcile.
Common Variations and Edge Cases
Tighter governance often increases operational overhead, requiring organisations to balance control assurance against delivery speed. That tradeoff is real in environments with third-party integrations, shared platforms, and legacy service accounts, where a single NHI may support multiple applications or vendors. Best practice is evolving on how much shared identity use is acceptable; there is no universal standard for this yet. What is clear is that shared or orphaned credentials make unified governance harder, because the policy may be consistent while the operational reality is not.
Edge cases usually appear in offboarding, vendor access, and emergency access. Human offboarding is often calendar-driven, but NHI revocation must also respond to application retirement, key compromise, pipeline changes, and secrets migration. Organisations should also treat excessive privilege differently from excessive visibility: a human account can be reviewed in a meeting, but an NHI needs automated telemetry and expiry logic. For incident patterns and exposure examples, the 52 NHI Breaches Analysis and the Cisco DevHub NHI breach show how machine identities can turn small configuration failures into broad compromise. The safest approach is to treat humans and NHIs as one governance programme with different control mechanics, not as one identity type with the same rule set.
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 address the attack and risk surface, while NIST CSF 2.0 and NIST Zero Trust (SP 800-207) set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-03 | Rotation and revocation are core NHI governance controls here. |
| NIST CSF 2.0 | PR.AC-1 | Unified governance depends on clearly managed identity access. |
| NIST Zero Trust (SP 800-207) | Separate operational rules fit a Zero Trust model for identities. |
Verify every human and NHI request at runtime using least privilege and continuous validation.
