Treat service accounts, API keys and automation tokens like privileged identities, not background plumbing. Inventory them, assign ownership, set expiry rules where possible, and revoke rights when the workload changes. NHI governance breaks down when machine access is outside the normal review and offboarding process.
Why This Matters for Security Teams
Excess access in non-human identities is not a paperwork issue, it is an escalation path. Service accounts, API keys, CI/CD tokens, and workload credentials often outlive the workload that created them, then drift into privileged roles that no one still needs. When access is not reviewed with the same discipline as human identities, excess privilege becomes normal and compromise becomes easier to spread laterally. NHIMG research shows that Ultimate Guide to NHIs found 97% of NHIs carry excessive privileges, which is why this issue shows up so often in breach analysis.
The governance failure is usually organisational, not technical. Teams may have PAM for humans, but machine identities sit outside joiner-mover-leaver workflows, so ownership is unclear and revocation is slow. Current guidance from the OWASP Non-Human Identity Top 10 and the NIST Cybersecurity Framework 2.0 both point toward least privilege, continuous monitoring, and lifecycle discipline, but the practical gap is still in inventory and accountability. In practice, many security teams discover NHI excess only after a token has already been reused in an environment it was never meant to reach.
How It Works in Practice
Effective governance starts by treating every NHI as an owned asset with a business purpose, not as background plumbing. That means assigning an owner, documenting the workload it supports, and defining the minimum permissions required for normal operation. Where possible, credentials should be short-lived, scoped to a narrow workload, and rotated automatically. The lifecycle view in NHIMG’s Ultimate Guide to NHIs — Lifecycle Processes for Managing NHIs is useful here because it ties provisioning, review, rotation, and offboarding into one control loop.
A practical operating model usually includes:
- Inventory every service account, API key, certificate, and automation token in one register.
- Map each NHI to a workload, owner, and expiry date or review interval.
- Remove standing admin rights and replace them with narrow RBAC roles where feasible.
- Use PAM for vaulting and approval, but do not assume vaulting alone equals governance.
- Revoke or reissue credentials when the workload, environment, or integration changes.
Evidence from NHIMG’s Top 10 NHI Issues is consistent with this approach: only 20% of organisations have formal offboarding and API key revocation processes, so stale access is common. That aligns with the NIST Cybersecurity Framework 2.0 emphasis on governance and continuous risk treatment. These controls tend to break down when credentials are hard-coded into pipelines or embedded in legacy automation because revocation then requires application changes, not just IAM action.
Common Variations and Edge Cases
Tighter control often increases operational overhead, requiring organisations to balance faster automation against stronger review and revocation discipline. That tradeoff is especially visible in high-frequency CI/CD, third-party integrations, and ephemeral cloud workloads, where long approval chains can slow delivery. Best practice is evolving, and there is no universal standard for this yet, but the direction is clear: fewer standing privileges, shorter credential lifetimes, and stronger evidence of intent at issuance time.
Some environments need special handling. Shared service accounts in legacy systems may not support per-task credentials, so organisations often compensate with vaulting, session recording, and aggressive rotation. Third-party and supplier-owned NHIs add another layer, because access may be technically valid long after the business relationship has changed. NHIMG’s Ultimate Guide to NHIs - Key Challenges and Risks is useful for understanding why this risk persists, while the 52 NHI Breaches Analysis shows how often compromised machine identities are involved once attackers find a stale token. In mature programmes, exception handling is logged, time-boxed, and reviewed separately so temporary access does not become permanent privilege.
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 and NIST AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-03 | Excess privilege and weak rotation are core NHI risks addressed here. |
| NIST CSF 2.0 | PR.AC-4 | Least-privilege access management is central to stopping NHI privilege creep. |
| NIST AI RMF | AI RMF supports governance for autonomous workloads and their access decisions. |
Assign accountability for each autonomous workload and evaluate its access behaviour at runtime.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on May 28, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
