Start with a complete inventory of certificates, keys, and the systems that use them. Without that baseline, teams cannot size the problem, assign ownership, or set lifecycle controls. Inventory gives visibility into where machine identities live, who depends on them, and which ones need policy, renewal, or retirement. It is the foundation for scaling machine identity management safely.
Why inventory is the first control when machine identities are scattered
When machine identities are poorly inventoried, the first problem is not rotation or privilege tuning, it is visibility. You need a baseline of what exists, where it is used, who owns it, and which applications or services depend on it before any lifecycle decision can be trusted. That inventory turns an unknown sprawl into a manageable set of identities, secrets, and dependencies.
A useful inventory should cover certificates, keys, tokens, service accounts, workload identities, and the systems that depend on them. For teams managing NHI at scale, that baseline is where ownership, renewal windows, and retirement decisions become possible. NHIMG’s Ultimate Guide to NHIs frames inventory as the starting point for lifecycle control, and the same discovery step underpins the practical move from scattered assets to governed machine identity management.
What a complete machine identity inventory must capture
A complete inventory is more than a list of secrets. It should map each identity-bearing item to its issuer, owner, workload, environment, expiration state, renewal path, and the business or technical service that will break if it is removed. That is what allows teams to distinguish safe candidates for policy enforcement from fragile dependencies that need a migration plan first.
The inventory also needs to capture relationships, not just objects. If a certificate authenticates an API, or a key unlocks a workflow used by multiple systems, the dependency graph matters as much as the credential itself. NHIMG’s Machine-to-Machine Identity Maturity Model is useful here because it ties certificates, OAuth tokens, rotation, and workload identity into a more complete operational view, which is exactly what scattered environments usually lack.
Discovery should include stale credentials, shared service accounts, hardcoded keys, and unmanaged certificates. Those are the entries most likely to hide outage risk or privilege sprawl because nobody has current accountability for them. The practical test is simple: if you cannot say what breaks when the identity is retired, the inventory is still incomplete.
How inventory enables ownership, lifecycle, and safe scaling
Once the baseline exists, teams can assign ownership, set renewal responsibilities, and establish retirement paths. Without that sequence, lifecycle work becomes guesswork and emergency response. Inventory is therefore the control that lets you move from reactive cleanup to repeatable governance across many teams, platforms, and clouds.
It also changes prioritisation. Identifiers with short expiry windows, cross-environment access, or broad service dependencies should move ahead of low-impact items because the operational blast radius is larger. NHIMG’s NHI Ownership and Accountability Guide is directly relevant because ownership is what converts a discovered identity into something that can actually be renewed, reviewed, or retired on schedule.
At scale, the inventory should be treated as a live control, not a one-time project artifact. If it is not continuously refreshed from cloud, platform, and application sources, it will quickly lag reality and teams will be back to managing machine identities by exceptions, memory, and tickets.
Risk and Threat Considerations
Poor inventory creates hidden exposure because unknown certificates and keys cannot be renewed, rotated, or revoked in a disciplined way. That makes forgotten identities attractive for both outages and abuse, especially where a stale credential still authenticates successfully long after the owning team has moved on.
Failure mechanism: Undiscovered or unmapped machine identities persist past their intended lifecycle, so attackers or accidental consumers can keep using them while defenders lack the visibility to find and remove them quickly.
Impact: The result can be credential misuse, privilege retention, service disruption during cleanup, and incomplete containment when a secret or certificate has to be remediated under pressure.
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 addresses the attack surface, CIS Controls v8 and NIST SP 800-53 Rev 5 set the technical controls, and ISO/IEC 27001:2022 defines the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | CIS-1 — Inventory and Control of Enterprise Assets | Machine identity discovery depends on knowing what assets and systems exist. |
| CIS-5 — Account Management | Ownership, lifecycle and retirement of machine identities are account-management concerns. | |
| Recommendation — Maintain a current inventory of systems that host or consume machine identities. Assign accountable owners and remove stale machine identities on a defined schedule. | ||
| NIST SP 800-53 Rev 5 | CM-8 — System Component Inventory | A complete component inventory is the control basis for discovering scattered machine identities. |
| IA-5 — Authenticator Management | Certificates, keys and tokens require lifecycle control once discovered. | |
| IA-9 — Service Identification and Authentication | Machine identities authenticate services and workloads, so their dependencies must be mapped. | |
| Recommendation — Inventory components that issue, store, or consume machine identity material. Track, rotate, and retire authenticators with defined expiration and revocation processes. Map service-to-service authenticators and verify each has an accountable owner. | ||
| ISO/IEC 27001:2022 | A.5.9 — Inventory of information and other associated assets | Inventory is the first step for locating machine identities and their dependencies. |
| A.5.16 — Identity management | Discovery must feed identity ownership and lifecycle control. | |
| Recommendation — Maintain an inventory of assets that hold or rely on machine identity material. Define ownership and lifecycle rules for machine identities once discovered. | ||
| OWASP Non-Human Identity Top 10 | NHI-01 — Improper Offboarding | You cannot retire machine identities safely without first knowing they exist. |
| NHI-07 — Long-Lived Secrets | Inventory exposes long-lived credentials that need rotation or retirement. | |
| Recommendation — Find and remove machine identities that no longer have a valid business or technical owner. Identify machine identities with secrets that exceed acceptable lifetime limits. | ||
Practitioner Guidance
What to prioritise: Start with identities that have external reach, broad service dependency, or long-lived credentials, because those create the highest combination of exposure and cleanup risk. If a secret can still authenticate to a production service, it belongs near the top of the inventory effort.
What to verify: For each entry, confirm an owner, an issuer, an expiry or rotation mechanism, and at least one known consuming system. If any of those fields are missing, the team does not yet have a trustable baseline.
Practitioner takeaway: The first win is not better rotation, it is a credible map of what exists, who depends on it, and which identities are safe to govern without breaking production.
Related resources from NHI Mgmt Group
- How should security teams extend PAM across human and machine identities without widening the attack surface?
- How should security teams implement a machine identity control plane across cloud and on-premises environments?
- How should security teams reduce credential stuffing risk across user and machine identities?
- How should security teams prevent unauthorized access across human and machine identities?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on September 26, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
