They break down when maturity is measured by policy presence instead of entitlement closure. Service accounts often persist after the work they support has changed, and manual offboarding leaves old credentials and permissions in place. That creates review blind spots, orphaned access, and a false sense of control even when the programme looks well governed.
Why This Matters for Security Teams
IAM maturity models usually assume identities can be classified, reviewed, and retired on a predictable cycle. That assumption works better for human users than for service account, which are created for pipelines, integrations, batch jobs, and application runtimes that change faster than the governance process. Once teams start scoring maturity by policy documentation alone, they can miss the real issue: whether each service account still has a valid business purpose and only the entitlements it actually needs.
This is where the gap becomes operational. NHI Mgmt Group’s Ultimate Guide to NHIs — What are Non-Human Identities notes that only 5.7% of organisations have full visibility into their service accounts, which means most maturity programmes are rating what they can document, not what they can control. The result is orphaned access, stale secrets, and entitlement sprawl that survives long after the original workload changes. In practice, many security teams encounter this only after a pipeline failure, a merger, or a credential exposure has already revealed how incomplete the inventory really was.
How It Works in Practice
Service-account-heavy environments need lifecycle management, not just policy coverage. Mature programmes tie each account to an owner, workload, and expiry condition, then verify that the account is still required whenever the workload changes. That means reviewing the account in the context of the application or automation it supports, not as a generic identity entry. The control objective is entitlement closure: if the workload no longer needs access, the account, its secrets, and any related tokens should be revoked together.
Current guidance from the NIST Cybersecurity Framework 2.0 aligns with this operational view because it emphasizes identity governance as an ongoing function, not a one-time project. For non-human identities, that usually means:
- discovering service accounts continuously across cloud, SaaS, CI/CD, and infrastructure layers;
- mapping each account to a named owner and a specific workload or tool chain;
- rotating or replacing long-lived secrets with short-lived credentials where possible;
- automating offboarding when the workload is retired, migrated, or replatformed;
- testing for dormant access and unused privileges rather than assuming periodic review is enough.
NHIMG research on the 2024 Non-Human Identity Security Report shows that 88.5% of organisations say their non-human IAM practices lag behind or merely match human IAM, which helps explain why maturity scores often look stronger than the actual control state. The practical fix is to measure closure: whether accounts are inventoried, owned, rotated, and revoked on time, not whether a policy exists. These controls tend to break down when service accounts are embedded in legacy automation with no reliable owner, because no one can safely assert who should approve removal.
Common Variations and Edge Cases
Tighter service-account control often increases operational overhead, requiring organisations to balance stronger entitlement closure against delivery speed and platform complexity. That tradeoff is real, especially where releases are frequent or account creation is deeply embedded in automated workflows. Current guidance suggests prioritising the highest-risk accounts first rather than trying to force every workload into the same review cadence.
Edge cases matter. Shared service accounts can be hard to eliminate immediately, but they should still have explicit ownership, scoped permissions, and short secret lifetimes. Break-glass automation accounts may need broader access, yet they should be heavily monitored and isolated from routine workloads. In hybrid and multi-cloud estates, one account can be valid in several control planes at once, so maturity models that rely on a single directory view will miss duplicated entitlements and shadow usage. The 52 NHI Breaches Analysis is a useful reminder that service-account compromise is often a persistence problem as much as an authentication problem.
The NIST Cybersecurity Framework 2.0 provides a good baseline, but there is no universal standard for how often service accounts should be reviewed across every environment. Organisations should treat review frequency, secret rotation, and offboarding triggers as risk-based decisions. Where application ownership is unclear, maturity scoring should be discounted rather than inflated by assumed control.
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 |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-01 | Service accounts need continuous discovery and inventory before maturity can be measured. |
| NIST CSF 2.0 | PR.AC-1 | Access governance fails when service-account entitlements are not continuously controlled. |
| NIST AI RMF | The question is about governance maturity and accountability for automated identities. |
Apply least-privilege and periodic entitlement review to every service account and automation credential.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on June 9, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
