Start by cleaning the identity foundation before expanding controls. Remove stale groups, assign clear ownership to every account, and make reviews broad enough to cover the access users and systems actually use. Identity hygiene fails when governance is fragmented, so the best programmes treat human and non-human access as one lifecycle discipline.
Why This Matters for Security Teams
Identity hygiene is often treated as an account cleanup exercise, but the real risk is governance drift across every place credentials, roles, and exceptions accumulate. Human and non-human accounts follow different lifecycles, yet attackers only need one stale group, one orphaned service account, or one overbroad entitlement to move laterally. That is why NHI Management Group consistently treats identity hygiene as a control-plane issue, not a ticket backlog, especially when secrets and access sprawl grow faster than review processes can absorb.
The scale problem is visible in NHI research: the Ultimate Guide to NHIs notes that NHIs outnumber human identities by 25x to 50x in modern enterprises, which means manual review models do not scale. NIST also frames identity as a core security outcome in the NIST Cybersecurity Framework 2.0, but current guidance suggests teams must apply that discipline across both workforce and machine identities if they want meaningful coverage.
In practice, many security teams encounter identity hygiene failures only after a breached service account, stale admin role, or forgotten API key has already been used to expand access.
How It Works in Practice
Reducing identity hygiene risk starts with one inventory, one ownership model, and one review process that covers the identities people see and the ones they usually miss. For human accounts, that means validating joiner, mover, and leaver workflows, then removing orphaned roles, inactive groups, and inherited access that no longer matches business need. For NHIs, the same discipline applies to service accounts, workload identities, API keys, certificates, and automation tokens, but with shorter renewal cycles and tighter revocation requirements.
Practitioners should combine governance and technical controls rather than relying on quarterly attestations alone. The Top 10 NHI Issues and the Ultimate Guide to NHIs both point to the same practical pattern: visibility, rotation, and offboarding failures compound quickly when ownership is vague. A workable programme usually includes:
- centralised identity inventory across workforce, applications, cloud, and automation
- named business and technical owners for every account and secret
- access reviews that include effective permissions, not only assigned roles
- expiry and rotation policies for secrets, certificates, and privileged tokens
- deprovisioning checks that confirm removal from groups, apps, vaults, and CI/CD tools
Mapping these tasks to the NIST Cybersecurity Framework 2.0 helps teams turn hygiene from a periodic audit into an operational control. The key is to treat identities as living assets with a lifecycle, not static records in a directory. These controls tend to break down in organisations with multiple IAM platforms and no shared ownership model because orphaned entitlements reappear faster than review teams can resolve them.
Common Variations and Edge Cases
Tighter identity hygiene often increases administrative overhead, so organisations have to balance stronger assurance against the cost of reviewing more accounts more often. That tradeoff becomes especially visible where teams run legacy directories, multiple cloud tenants, contractor access, or machine identities created outside the main IAM system. Current guidance suggests that broad coverage matters more than perfect tooling, because blind spots are riskier than imperfect but consistent governance.
One common edge case is shared or embedded access in automation pipelines. Those identities are easy to overlook because they do not map cleanly to a person or a single application owner, yet they often hold high privilege and long-lived secrets. Another edge case is service accounts created for short projects that survive into production without a clear retirement path. In both cases, best practice is evolving toward explicit ownership, scoped credentials, and aggressive expiry rather than relying on implicit trust.
Teams should also be careful not to separate “human hygiene” and “NHI hygiene” into different programmes. The attack path rarely respects that boundary, and the same stale group, unmanaged privilege, or forgotten exception can affect both. NHI Management Group’s 2024 ESG Report: Managing Non-Human Identities found that 72% of organisations have experienced or suspect a breach of non-human identities, which reinforces that hygiene gaps are not theoretical. The practical answer is a single lifecycle discipline with differentiated controls where the identity type demands it.
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 AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | PR.AC | Identity hygiene is fundamentally about access control and lifecycle governance. |
| OWASP Non-Human Identity Top 10 | NHI-01 | Stale secrets and overprivileged non-human accounts are direct NHI hygiene risks. |
| NIST AI RMF | AI RMF supports accountable governance for automated identities and their access decisions. |
Unify access reviews, deprovisioning, and ownership checks across human and machine identities.
