They often assume a scheduled review can correct access drift after the fact. For NHIs, that is too slow if entitlements are created, used, and forgotten between review cycles. Effective governance needs live visibility, automated cleanup, and a way to validate whether access is still in use.
Why This Matters for Security Teams
Access reviews are still useful, but for NHIs they are often the wrong control if they are treated as the primary defence. Service accounts, API keys, tokens, and certificates can be created, chained into workflows, and forgotten long before the next quarterly certification. NHI Management Group’s Ultimate Guide to NHIs notes that 97% of NHIs carry excessive privileges, which makes delayed review cycles especially risky. The issue is not only excess access, but also the lack of live proof that the access is still needed.
Security teams often assume that an approver can retrospectively validate entitlement, yet that model breaks when credentials are copied into pipelines, reused across apps, or left active after the original workload changes. The OWASP Non-Human Identity Top 10 reflects this problem as a lifecycle and governance failure, not just a permissions issue. In practice, many security teams discover NHI sprawl only after a token exposure, not through intentional access review.
How It Works in Practice
For NHIs, effective governance starts with live inventory and usage telemetry, not with a spreadsheet of entitlements. Identity teams need to know which workload owns the identity, what system issued the secret, where it is used, when it last authenticated, and whether the access is still tied to an active business process. That means access review evidence should come from runtime signals such as authentication logs, secret manager events, workload metadata, and policy decisions, rather than from manager attestations alone.
Current guidance suggests combining review workflows with automated hygiene controls. That usually includes short-lived credentials, rotation triggers, and revocation for unused or orphaned identities. The NHI Lifecycle Management Guide and the Top 10 NHI Issues both point to the same operational pattern: review is a checkpoint, but lifecycle enforcement is the control. A practical process usually includes:
- classifying each NHI by owner, workload, environment, and privilege tier
- correlating every entitlement to observed use within a defined time window
- flagging dormant, shared, or over-privileged NHIs for automatic quarantine
- revoking secrets that are no longer attached to an active workload
- revalidating exceptions on a shorter cadence for privileged or internet-facing identities
That approach aligns with zero trust thinking because trust is re-evaluated at each use, not inherited indefinitely from an old certification. It also reduces false confidence from periodic recertification, which can miss identities that were created and exploited between review cycles. These controls tend to break down in highly ephemeral CI/CD environments because identities may exist only for minutes and disappear before manual reviewers can even inspect them.
Common Variations and Edge Cases
Tighter review controls often increase operational overhead, requiring organisations to balance governance value against the friction of high-churn automation. That tradeoff is especially visible in CI/CD pipelines, ephemeral containers, and partner integrations where a human owner may not be the right reviewer in the first place. In those environments, the better question is often whether the identity should exist at all, or whether it should be replaced with JIT issuance and automatic expiry.
There is no universal standard for this yet, but best practice is evolving toward context-aware review. Some teams review NHIs by application ownership, others by secret class or data sensitivity, and the most mature programs add real-time policy checks before a secret is issued. The 52 NHI Breaches Analysis shows why this matters: review after the fact does little when compromise happens through reuse, exposure, or offboarding gaps. NHI review programs also need exceptions for shared service accounts, where one identity may support multiple systems but still be too risky to certify as a single unit. In those cases, the review should target isolation and replacement, not just approval. The hardest failures appear when dormant access looks normal on paper because no one is checking whether the workload still exists.
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-03 | Addresses weak lifecycle controls that make scheduled reviews miss dormant NHI access. |
| NIST CSF 2.0 | PR.AC-4 | Supports least-privilege access governance and periodic entitlement validation. |
| NIST AI RMF | Applies governance and accountability principles to autonomous or dynamic NHI behaviour. |
Tie every NHI entitlement to an owner and automate revocation when usage stops or the workload is retired.
