Should organisations prioritize zero standing privilege for service accounts?

Why This Matters for Security Teams

Service accounts are often where privilege sprawl hides in plain sight: they are created for uptime, rarely revalidated, and frequently exempted from the same oversight applied to human users. That is exactly why zero standing privilege matters. When access is always on, compromise is only a matter of time. NHI Mgmt Group research shows that 97% of NHIs carry excessive privileges, and only 5.7% of organisations have full visibility into their service accounts, which makes dormant access especially dangerous. The risk pattern is consistent with what the OWASP Non-Human Identity Top 10 flags for overprivileged and poorly governed machine identities, and it aligns with the findings in Ultimate Guide to NHIs - Key Challenges and Risks.

The practical question is not whether a service account is “trusted,” but whether its access can be made ephemeral, task-bound, and observable enough to withstand compromise. That changes how teams design authentication, secrets handling, and revocation. In practice, many security teams discover the service account problem only after a breach review shows that the oldest credentials were also the broadest ones.

How It Works in Practice

Zero standing privilege for service accounts means the account exists, but the permission does not remain continuously active. Access is issued only when a workload needs it, with the narrowest scope and the shortest feasible time-to-live. For teams already using PAM, this usually means moving beyond vaulting static passwords and toward JIT credential issuance, workload identity, and policy checks at request time. The goal is to replace “always valid” secrets with short-lived tokens, certificates, or federated assertions that can be revoked automatically.

Operationally, that usually includes three layers. First, bind the service account to a workload identity so the system can prove what the caller is, not just what secret it has. Second, issue ephemeral secrets or tokens per task, then expire them as soon as the job completes. Third, enforce intent-based authorisation so the request is evaluated in context, rather than by a standing RBAC grant that outlives the task. Current guidance from the OWASP Non-Human Identity Top 10 and the 52 NHI Breaches Analysis both point to the same pattern: long-lived machine access is difficult to govern and easy to abuse.

• Use JIT provisioning for privileged actions instead of permanent entitlements.
• Prefer short-lived secrets with explicit TTLs over reusable static credentials.
• Attach approvals, policy checks, and logging to the issuance event, not just the login event.
• Revoke credentials automatically when the workload ends, fails, or changes purpose.

This approach works best when identity, policy, and orchestration are integrated. These controls tend to break down when legacy applications require embedded passwords or when batch jobs share one account across many unrelated systems because revocation becomes too blunt to be safe.

Common Variations and Edge Cases

Tighter privilege controls often increase deployment overhead, requiring organisations to balance operational continuity against the security benefit of shorter credential lifetimes. That tradeoff is real in environments with brittle legacy integrations, shared middleware, or vendor-managed schedulers, where a hard move to ZSP can interrupt production if dependency mapping is incomplete. Best practice is evolving, and there is no universal standard for this yet, but the direction is clear: the more autonomous or reusable the service path, the less defensible standing access becomes.

Some teams will keep a narrow set of break-glass credentials for recovery, but those should be treated as exceptions with stronger monitoring, shorter expiry, and tighter approval than ordinary service access. Others may phase in JIT by first reducing permissions, then shortening token lifetimes, then replacing passwords with federated or certificate-based identity. The important distinction is that ZSP is not just a tooling choice; it is an operational model that assumes compromise will happen and limits what a compromised account can do.

For organisations building toward Zero Trust, NHI Mgmt Group notes that 90% of IT leaders see proper NHI management as essential to successful zero-trust implementation, which is why service accounts should be brought under the same review discipline as human privileged users. The Dropbox Sign breach is a reminder that machine identities can become the shortest path to production when standing access is left in place too long.

Related resources from NHI Mgmt Group

• When should organisations prioritise Zero Standing Privilege for non-human identities?
• Why do Active Directory service accounts complicate zero trust programs?
• Why do NHIs complicate zero trust and least privilege efforts?
• How can organisations reduce hidden privilege in service accounts and tokens?