Why does privileged access management matter for both human admins and service accounts?

Why Privileged Access Management Has to Cover Both Humans and Service Accounts

Privileged access management is not only about locking down admin logins. It also has to govern service accounts, API keys, tokens, certificates, and other machine credentials that can reach the same sensitive systems. The risk profile differs, but the control objective is the same: limit standing privilege, make access visible, and keep every privileged action reviewable under OWASP Non-Human Identity Top 10 and the NIST control model in NIST Cybersecurity Framework 2.0.

For human admins, PAM reduces abuse of interactive sessions, weak approval chains, and excessive permanent rights. For service accounts, PAM addresses a different problem: credentials that never log out, are copied into code and pipelines, and quietly survive long after the workload changes. NHIMG research shows that 97% of NHIs carry excessive privileges and only 5.7% of organisations have full visibility into their service accounts, which is why this issue tends to be discovered during incident response rather than routine review. In practice, many security teams encounter privilege sprawl only after an account is abused or a key is leaked, rather than through intentional lifecycle control.

How PAM Works Across Interactive and Non-Interactive Privilege

Effective PAM uses one governance model for both actor types, but applies it differently. For humans, the focus is on strong authentication, time-bound elevation, session recording, and approval workflows. For service accounts, the focus shifts to workload identity, short-lived credentials, secret rotation, and tightly scoped machine-to-machine authorization. The guiding idea is least privilege, but the implementation must reflect whether the actor is a person at a keyboard or an automated process calling an API.

That is why current guidance increasingly pairs traditional PAM with NHI lifecycle management. NHIMG’s Ultimate Guide to NHIs and Lifecycle Processes for Managing NHIs emphasize that machine identities need the same visibility and offboarding discipline as human users. In practice, that means:

• Replacing standing access with just-in-time elevation for admins.
• Issuing short-lived secrets or tokens to workloads instead of embedding static keys.
• Binding service accounts to workload identity and environment context.
• Logging both interactive sessions and machine-initiated privileged actions.
• Reviewing privileged grants on a scheduled basis, not only after incidents.

Standards support this direction. NIST SP 800-53 Rev. 5 expects access enforcement, account management, and auditability, while OWASP’s NHI guidance treats credential lifecycle and privilege exposure as core risks. These controls tend to break down when legacy applications require shared daemon accounts with no token broker because credential ownership and revocation become ambiguous.

Common Variations and Edge Cases That Change the Control Design

Tighter privilege controls often increase operational overhead, so organisations have to balance agility against assurance. That tradeoff is most visible where admin access supports production incidents or where service accounts are deeply embedded in legacy systems. Best practice is evolving, and there is no universal standard for this yet, especially for high-frequency automation and multi-team platform environments.

One edge case is break-glass access. Human admins may need emergency standing privilege, but that should be rare, time-limited, and heavily monitored. Another is shared service accounts, which may still exist in older platforms but create poor attribution and difficult revocation. A third is third-party automation, where a vendor’s integration may look like a service account but actually behaves like a persistent external operator. NHIMG’s Top 10 NHI Issues and Key Challenges and Risks show why these exceptions matter: excess privilege, poor rotation, and weak offboarding are the conditions that turn both human and machine access into breach paths.

Where PAM succeeds, it treats every privileged actor as accountable, time-bounded, and observable. Where it fails, teams assume machine accounts are “less risky” than admins and leave them with the longest-lived access in the environment.

Related resources from NHI Mgmt Group

• Why do service-account and privileged-access records matter in defence compliance?
• Why does data access governance matter for service accounts and other non-human identities?
• Why do non-human accounts make privileged access management harder?
• Why do access certification processes often fail for workloads and service accounts?