They assume secret removal automatically equals governance maturity. In practice, access can still be over-broad, hard to audit, and difficult to reconcile across human and machine users. If the organisation cannot answer who can reach a workload and why, the security problem has only changed form.
Why This Matters for Security Teams
Replacing shared or embedded secrets with managed service identities is a useful control, but it does not automatically solve identity governance. The common mistake is treating credential removal as the end state instead of the beginning of a broader access model. If the managed identity can still reach too many APIs, subscriptions, queues, or data stores, the blast radius remains large. NHIMG’s research on the Guide to the Secret Sprawl Challenge shows how often the real issue is not just secret leakage, but unmanaged privilege growth across environments.
Security teams also underestimate how difficult these identities are to audit once they are adopted at scale. The machine account is no longer a visible secret sitting in a vault, so ownership, approval logic, and access rationale become easier to lose across cloud, CI/CD, and service-to-service traffic. That is why guidance from the NIST Cybersecurity Framework 2.0 still matters here: identity controls must be observable, governed, and tied to business context, not just technically absent of passwords. In practice, many security teams encounter excessive managed identity privilege only after lateral movement or data access has already occurred, rather than through intentional access design.
How It Works in Practice
A managed service identity changes how a workload authenticates, but it does not define what that workload should be allowed to do. Teams often replace a secret with a platform-managed credential and then inherit whatever permissions were easiest to assign during deployment. That is an improvement over long-lived static secrets, but it is not yet mature governance. The OWASP Non-Human Identity Top 10 is explicit that over-privilege, weak lifecycle control, and poor visibility remain common NHI failure modes.
Practitioners should separate authentication from authorisation and review both continuously. A workable pattern usually includes:
- Assigning one identity per workload or service boundary, not per environment if that creates hidden trust overlap.
- Restricting permissions to the minimum resource set, action set, and network path the workload truly needs.
- Binding identity usage to logs, owners, deployment pipelines, and change records so access can be explained later.
- Reviewing whether managed identity access is still justified after application changes, not only during initial provisioning.
NHIMG’s Ultimate Guide to NHIs — Lifecycle Processes for Managing NHIs is useful here because the lifecycle is the control, not the identity type itself. A good rollout also distinguishes secrets that can be eliminated from secrets that still exist for bootstrap, federation, or cross-platform integration. These controls tend to break down when a single managed identity is reused across multiple services because privilege creep becomes invisible inside one apparently “secretless” account.
Common Variations and Edge Cases
Tighter identity segmentation often increases deployment overhead, requiring organisations to balance operational simplicity against auditability and blast-radius reduction. That tradeoff becomes especially visible in legacy estates, where one service identity may still need to touch multiple databases, queues, or storage accounts because the application was never designed for least privilege. In those cases, current guidance suggests moving toward narrower identities incrementally rather than assuming a clean cutover is possible.
There are also edge cases where managed identities are only one layer of the answer. Build systems, third-party integrations, and cross-account automation may still need short-lived tokens, workload federation, or explicit approval workflows. Secrets may be gone from code, but trust can still be overly broad if the identity boundary is too large or if human and machine access are reviewed in separate processes. The practical test is simple: can the organisation explain who can reach each workload, what actions they can take, and why that access exists?
NHIMG’s Top 10 NHI Issues is a useful reminder that visibility failures often matter more than credential format, while the managed identity conversation should be read alongside Ultimate Guide to NHIs — Static vs Dynamic Secrets when deciding whether a secret can truly be removed. The most common gap is not technical support for managed identities, but the absence of a governance model that keeps their privilege honest over time.
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 | Managed identities still fail when non-human access is over-broad or poorly governed. |
| NIST CSF 2.0 | PR.AC-4 | Access rights must stay least-privilege even after secrets are removed. |
| NIST AI RMF | Autonomous or automated workloads need governance beyond simple credential replacement. |
Establish accountability, monitoring, and policy oversight for machine-driven access decisions.
