What breaks when cloud access reviews do not include machine identities?

Why This Matters for Security Teams

When cloud access reviews exclude machine identities, the review process stops measuring a large part of the real attack surface. Service accounts, workload tokens, API keys, and automation principals can retain access long after the human approver believes the entitlement set is clean. That creates hidden privilege accumulation, masks segregation of duties conflicts, and weakens the value of certification campaigns that are supposed to reduce risk. The problem is not just inventory; it is governance blind spot.

Practitioners should treat this as an identity hygiene issue and an operational risk issue at the same time. The Ultimate Guide to NHIs explains why NHI sprawl becomes hard to see once teams rely on static approval workflows, while the OWASP Non-Human Identity Top 10 highlights the control failures that occur when machine identities are left out of governance. NHIMG research shows the maturity gap is still wide: The 2024 Non-Human Identity Security Report found that 88.5% of organisations say their non-human IAM lags behind or only matches human IAM.

In practice, many security teams discover that “clean” access reviews still leave standing automation behind only after an incident or audit exception exposes the gap.

How It Works in Practice

Cloud access reviews usually work best for named people because the reviewer can judge role, job function, and exception history. Machine identities behave differently. An agent, deployment pipeline, or scheduled workload may need access only for a narrow task, then no access at all. If the review process only asks whether a human still needs the role, the underlying service account can continue to authenticate and act indefinitely.

That is why current guidance increasingly points toward workload identity, NHI lifecycle management, and short-lived authorization rather than periodic human-style recertification. In practice, teams should inventory every machine principal, map it to an owner and business purpose, and validate three things during review: whether the workload still exists, whether the scope still matches the current task, and whether the credential is still active. For higher-risk automation, access should be issued through just-in-time provisioning and revoked automatically when the task completes.

• Include service accounts, CI/CD identities, API clients, workload tokens, certificates, and secrets in the certification scope.
• Check for orphaned identities, duplicated permissions, and accounts used by more than one workload.
• Review standing privilege separately from active use, especially where PAM or RBAC is being used as a proxy for runtime trust.
• Prefer ephemeral secrets and request-time authorization decisions over long-lived static credentials.

The 52 NHI Breaches Analysis shows how quickly overlooked machine access becomes an attacker’s persistence path, and the OWASP Non-Human Identity Top 10 reinforces that non-human access needs explicit ownership, rotation, and monitoring. These controls tend to break down when multi-cloud teams keep identities in separate consoles because no single review process sees the full entitlement chain.

Common Variations and Edge Cases

Tighter machine-identity controls often increase operational overhead, requiring organisations to balance revocation speed against deployment reliability. That tradeoff becomes sharper in environments with heavy automation, shared pipelines, and ephemeral infrastructure.

There is no universal standard for this yet, but best practice is evolving toward context-aware review rather than static approval of machine roles. For example, a batch job that runs weekly may legitimately need continuous authentication, but its credentials should still be short-lived and traceable to a business owner. By contrast, an abandoned integration may still pass every human review because no person is assigned to it, even though it remains fully capable of accessing cloud resources.

NHIMG research suggests why this matters operationally: the Ultimate Guide to NHIs — Key Challenges and Risks notes the persistent problem of overextended non-human access, and the 2024 Non-Human Identity Security Report found 59.8% of organisations see value in dynamic ephemeral credentials, which is a strong signal that static secrets are no longer sufficient for modern cloud estates.

In regulated environments, the edge case is often shared ownership: platform teams, application teams, and security teams may all believe another group is reviewing the machine identity. In those cases, the fix is not just broader certification, but explicit lifecycle ownership, periodic attestation of business use, and continuous monitoring of credential age and usage. Where autonomous workloads are involved, access should be evaluated at request time against current intent, not just against an old role assignment.

Related resources from NHI Mgmt Group

• What breaks when access reviews do not include machine and AI identities?
• How should security teams run access reviews for non-human identities?
• How should security teams govern non-human identities that have persistent access?
• How should security teams govern non-human identities in cloud environments?