Teams should centralise workload identity and access management under a policy-based model that issues access dynamically and enforces least privilege consistently. That reduces the number of ad hoc secrets to track, simplifies governance, and gives security teams a clearer control point for authentication decisions. It also helps developers avoid managing security mechanics in every workload.
Why service account sprawl becomes a governance problem
service account sprawl usually starts as an operational convenience and ends as an access-control problem. When every workload has its own long-lived credential pattern, teams lose a clear inventory of who can authenticate, where those credentials live, and which permissions are still justified. The governance burden grows faster than the application estate, so access decisions become inconsistent and harder to audit.
That is why the best response is usually to move from ad hoc, workload-by-workload secrets toward a central policy layer that issues access dynamically. A policy-based model makes the access path more consistent, reduces dependency on manually managed secrets, and gives security teams a single place to evaluate least privilege, expiration, and ownership.
service account sprawl is also a visibility issue. NHI Mgmt Group’s Ultimate Guide to NHIs notes that only 5.7% of organisations have full visibility into their service accounts, which shows how quickly unmanaged growth turns into blind spots. When teams cannot reliably discover or classify accounts, governance becomes reactive instead of policy-driven.
What centralised workload access should actually change
A centralised model should change three things at once: how access is issued, how it is reviewed, and how it is revoked. Access should be granted based on policy and workload context, not embedded in every service as a separately managed secret. Review should focus on the policy and its scope, rather than hunting through every deployment for hidden credentials.
Practically, that means treating workload access as a governed control plane, not as a collection of local exceptions. Teams should prefer short-lived or dynamically issued access where possible, map each workload to an owner, and ensure permissions are tied to a clear business or technical purpose. If the access path cannot be explained in one place, it is probably already too fragmented.
For teams standardising workload identity, the SPIFFE workload identity specification is a useful reference point because it formalises identity, attestation, and trust for workloads. NHIMG’s Guide to SPIFFE and SPIRE and Machine-to-Machine Identity Maturity Model both support the same direction: reduce secret sprawl by making workload authentication and trust more explicit.
Risk and Threat Considerations
Service account sprawl increases the chance that dormant, overprivileged, or poorly owned credentials will be missed during rotation, review, or incident response. It also broadens the attack surface because one exposed secret can unlock multiple systems, and stale permissions often persist long after the workload has changed.
Failure mechanism: Long-lived credentials and fragmented ownership allow secrets to be copied into code, pipelines, or configuration, then reused outside the original control process. Once the governance model is decentralized, security teams lose reliable visibility into which accounts are active, which are excessive, and which should be revoked first.
Impact: Compromise of a single workload credential can lead to unauthorized access, lateral movement, and delayed detection. NHIMG’s Key Challenges and Risks section highlights overprivilege and unmanaged credentials as core failure modes, and its published data shows 97% of NHIs carry excessive privileges, which is exactly why decentralised sprawl becomes a security issue, not just an administration issue.
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, CIS Controls v8 and NIST Zero Trust (SP 800-207) set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-01 — Secrets and Credential Management | Centralising workload access reduces secret sprawl and ad hoc credential handling. |
| NHI-03 — Overprivileged NHI | Service account sprawl often leaves workloads with excessive permissions. | |
| NHI-05 — NHI Discovery and Inventory | Sprawl becomes governable only when service accounts are consistently inventoried and owned. | |
| Recommendation — Move workload access to short-lived, centrally governed credentials instead of embedded long-lived secrets. Review workload entitlements and remove access that exceeds each service's minimum needed scope. Inventory all workload identities and tie each one to an owner, purpose, and lifecycle state. | ||
| NIST CSF 2.0 | GV.OC-01 — Organizational Context | Workload access governance depends on clear ownership and organisational accountability. |
| PR.AA-01 — Identity Management, Authentication, and Access Control | The question is directly about governing workload access and how it is authenticated. | |
| PR.PS-01 — Least Functionality | Least privilege is the core control response to sprawl and overbroad service account access. | |
| Recommendation — Assign accountable owners for workload access policies and review them on a defined cadence. Implement consistent access issuance and verification for workloads through a central policy model. Limit each workload to only the functions and permissions it actually requires. | ||
| CIS Controls v8 | 6.3 — Establish and Maintain an Access Granting Process | A policy-based model is an access-granting process that replaces ad hoc workload approvals. |
| 5.3 — Disable Dormant Accounts | Service account sprawl often leaves unused workload accounts active far too long. | |
| Recommendation — Standardise how workload access is approved, issued, reviewed, and removed. Identify and disable inactive workload accounts before they become a hidden access path. | ||
| NIST Zero Trust (SP 800-207) | AC-1 — Policy-based Access Control | The answer recommends policy-driven, dynamically issued workload access under central governance. |
| ID-1 — Identity Governance and Lifecycle | Central governance requires lifecycle control over workload identities and their access. | |
| Recommendation — Enforce workload access through policy decisions rather than persistent local trust. Bind workload identities to lifecycle, ownership, and revocation processes. | ||
Practitioner Guidance
What to prioritise: Start by finding the workload credentials that combine broad access with weak ownership. Those are the accounts most likely to resist cleanup because they are both high impact and poorly understood. If a credential can authenticate to production and no team can state its owner and purpose quickly, treat it as a governance priority.
What to verify: Before trusting any centralised model, verify that access is actually being issued dynamically, that permission scopes are bounded, and that revocation can happen without waiting on application-specific manual steps. A central policy only helps if it is the real enforcement point, not just a reporting layer.
Practitioner takeaway: The goal is not merely to have fewer service accounts, but to make every remaining workload access path discoverable, attributable, and replaceable without operational guesswork.
Related resources from NHI Mgmt Group
- How should security teams govern non-human identities that have persistent access?
- How should security teams govern API keys used for generative AI access?
- How should security teams govern Active Directory service accounts?
- How should security teams govern service accounts, machine identities and workload access differently?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on September 19, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
