Why do organisations struggle to secure access properly when service accounts and SaaS permissions are both in scope?

Because the control plane splits across layers. Service accounts, file permissions, and inherited access require data-aware visibility, while SaaS entitlements and reviews sit in the identity layer. When teams only see one side, they miss nested groups, orphaned access, and app-specific entitlements. The result is incomplete least privilege and weak audit evidence across hybrid environments.

Why This Matters for Security Teams

Mixed access estates create a blind spot because the security team is not just governing users anymore. Service accounts, inherited file permissions, and application-level SaaS entitlements are often reviewed in different tools by different owners, so least privilege becomes a moving target. That fragmentation makes it easy to approve access that looks clean in an identity dashboard while still leaving broad data paths open behind the scenes.

This is exactly where NHI risk becomes visible at scale. NHIs often outnumber human identities by 25x to 50x in modern enterprises, and Ultimate Guide to NHIs notes that only 5.7% of organisations have full visibility into their service accounts. When that visibility gap is paired with SaaS permission sprawl, audit evidence becomes inconsistent and remediation stalls. Standards like the OWASP Non-Human Identity Top 10 and NIST SP 800-53 Rev 5 Security and Privacy Controls both point toward stronger inventory, access governance, and review discipline, but the operational challenge is stitching those layers together.

In practice, many security teams discover the real exposure only after a user, service account, or app token has already accumulated more access than anyone intended.

How It Works in Practice

Proper access control in this scenario starts with a unified entitlement view. Service accounts must be mapped to the data, systems, and downstream APIs they can reach, while SaaS permissions must be tied to the business app, group membership, and inherited roles that grant them. Without that correlation, a team can remove a direct SaaS role and still leave access intact through a nested group, shared mailbox, or automation account.

Practically, security teams need three layers of control:

• Inventory all service accounts, API keys, and machine credentials with owner, purpose, and expiry data.
• Resolve inherited permissions, nested groups, and app-specific entitlements into an effective access graph.
• Review both identity-layer and data-layer permissions in the same campaign, so remediation can remove the true source of access.

That approach aligns with the evidence trails seen in incidents such as the 52 NHI Breaches Analysis, where credential sprawl and weak ownership repeatedly turn into broader access failures. It also matches the intent of OWASP NHI guidance, which treats visibility and lifecycle management as foundational rather than optional. In mature environments, current guidance suggests pairing entitlement review with periodic token and secret rotation, because static access records quickly diverge from actual effective access.

The key operational point is that SaaS reviews alone do not prove data protection, and file or service-account reviews alone do not prove identity governance. These controls tend to break down when permissions are inherited across multiple SaaS tenants, because the effective access path cannot be reconstructed reliably from a single system of record.

Common Variations and Edge Cases

Tighter access reconciliation often increases review overhead, requiring organisations to balance stronger assurance against slower change cycles. That tradeoff becomes more pronounced in hybrid estates where one team owns identity governance and another owns application administration, because no single control owner can see the full path from account to data.

There is no universal standard for this yet, so best practice is evolving. Some organisations treat service accounts as part of privileged access management, while others classify them as workload identities and govern them through lifecycle controls, secret rotation, and conditional approvals. The right answer depends on whether the account is interactive, automated, or embedded in a SaaS workflow.

Edge cases matter most when:

• service accounts are shared across jobs or environments, making ownership unclear;
• SaaS roles are granted through groups that are managed outside the app;
• permissions are inherited from folders, workspaces, or parent projects;
• tokens are long-lived and cannot be tied to a clear business purpose.

In those environments, access reviews can look complete while still missing the true privilege path. That is why NHI governance must be joined to SaaS entitlement management rather than treated as a separate programme, especially when organisations are trying to close audit gaps and reduce the attack surface.

Related resources from NHI Mgmt Group

• What problem does ownership attribution solve for service accounts and API keys?
• When do service accounts become a higher risk than ordinary user accounts?
• How should security teams govern Active Directory service accounts?
• Should organisations use just-in-time access for service accounts?