How should security teams govern service accounts that PAM does not fully cover?

They should treat service accounts as a separate identity class with explicit ownership, lifecycle states, and rotation rules. PAM may still help with human privileged access around those systems, but it will not by itself discover all machine identities, track their consumers, or offboard them cleanly when applications change.

Why This Matters for Security Teams

PAM is useful for controlling human-admin sessions, but service account are machine identities with different failure modes: they can be embedded in code, consumed by CI/CD jobs, called by other services, and left active long after the original owner has moved on. That is why security teams need an NHI-specific governance model with explicit ownership, lifecycle tracking, and revocation paths, as outlined in the Ultimate Guide to NHIs — Lifecycle Processes for Managing NHIs. NIST also treats identity and access governance as a core control objective in NIST Cybersecurity Framework 2.0, which is a good reminder that privileged tooling alone is not an identity program. The scale problem is real too: NHI Mgmt Group reports that only 5.7% of organisations have full visibility into their service accounts, which means most teams are operating with blind spots rather than complete inventories. In practice, many security teams only discover missing ownership and stale service accounts after a decommissioning or breach review, rather than through intentional lifecycle control.

How It Works in Practice

Treat service accounts as a distinct identity class and assign an accountable owner for each one, not just a system administrator. Governance should cover creation, approval, purpose, consumer mapping, rotation, logging, and offboarding. PAM can still sit around the edges for human break-glass access, but the service account itself needs lifecycle controls that are closer to NHI governance than to classic privileged session management. NHI Mgmt Group’s Top 10 NHI Issues highlights why this matters: excessive privilege and weak visibility are persistent drivers of exposure.

A practical operating model usually includes:

• Inventory every service account, token, key, and certificate, then tag each with owner, app, environment, and business purpose.
• Set lifecycle states such as requested, active, dormant, under-rotation, and retired so offboarding is measurable.
• Use least privilege and RBAC where it fits, but review entitlements against actual machine-to-machine call paths.
• Rotate secrets on a fixed schedule or on event, and prefer short-lived credentials where the platform supports it.
• Log consumers and downstream dependencies so the account can be removed without breaking hidden integrations.

This aligns with NIST’s identity governance emphasis in NIST Cybersecurity Framework 2.0 and with audit-oriented lifecycle expectations in Ultimate Guide to NHIs — Regulatory and Audit Perspectives. These controls tend to break down in legacy application estates because service account usage is hard-coded, undocumented, and shared across multiple jobs with no clean dependency map.

Common Variations and Edge Cases

Tighter service account governance often increases operational overhead, so organisations have to balance security gains against release velocity and application fragility. That tradeoff is especially visible in legacy middleware, mainframe integrations, and vendor-managed systems where credential replacement is risky or unsupported. Current guidance suggests a risk-based approach: the highest-privilege and externally exposed accounts should move first to stricter controls, while low-risk accounts can be remediated in phases.

There is no universal standard for this yet, but best practice is evolving toward stronger machine identity controls, especially where secrets are reused across pipelines or stored outside dedicated secrets managers. If PAM cannot discover an account, cannot tell you who consumes it, or cannot prove when it was last rotated, then it is not enough on its own. Security teams should also watch for accounts that look inactive but still authenticate through automation, because dormant does not mean safe. For broader breach patterns involving this identity class, the 52 NHI Breaches Analysis shows how often machine credentials remain an open path long after teams believe they are controlled. Where application owners resist change, the most realistic path is staged migration to dedicated workload identities and short-lived secrets rather than a sudden PAM-only retrofit.

Related resources from NHI Mgmt Group

• How should security teams govern Active Directory service accounts?
• How should security teams govern privileged access across service accounts and AI-driven systems?
• How should security teams govern Snowflake access for service accounts?
• How should security teams govern service accounts and API keys across cloud platforms?