How should organisations govern NHIs beyond quarterly access reviews?

Why This Matters for Security Teams

Quarterly access reviews are useful for cleanup, but they are too slow to govern identities that mint tokens, call APIs, and trigger production actions every minute. Non-human identities are often overprivileged, widely duplicated, and poorly inventoried, which means a review can confirm a stale directory record while the real authority problem keeps moving. NHI governance has to focus on issuance, runtime use, and revocation, not just membership in a role. That is the difference between administrative hygiene and actual control. The Ultimate Guide to NHIs shows why this matters: 97% of NHIs carry excessive privileges, increasing unauthorised access and broadening the attack surface. That finding aligns with the broader control expectations in the NIST Cybersecurity Framework 2.0, which pushes organisations toward continuous risk management rather than annual or quarterly point-in-time checks. Security teams also need to account for the way secrets are embedded in code, pipelines, and automation tools, which makes “review-only” governance fragile. In practice, many security teams encounter compromise only after an overprivileged token has already been reused, copied, or left active long after the workload changed.

How It Works in Practice

Effective governance starts with an authoritative inventory of service accounts, API keys, certificates, tokens, and agents, then assigns each one an owner, purpose, and expiry discipline. The control objective is to prove what the identity can do at runtime, not just what directory groups suggest it should do. Current guidance suggests pairing least privilege with short-lived credentials, step-up approval for sensitive actions, and automated revocation when a workload retires or changes function. For agentic or autonomous workloads, that often means moving from static RBAC toward intent-based authorisation and policy evaluation at request time. The OWASP Non-Human Identity Top 10 is useful here because it frames the common failure modes around credential sprawl, weak lifecycle controls, and excessive authority. The operational pattern is straightforward:

• issue the minimum secret or workload token needed for the task
• bind it to a specific workload identity and a narrow time window
• log issuance, use, and revocation as evidence
• reconcile actual runtime access against intended permissions continuously

That approach becomes more robust when supported by the lifecycle and audit perspective in the Ultimate Guide to NHIs — Regulatory and Audit Perspectives and the operational guidance in the NHI Lifecycle Management Guide. For many teams, the strongest evidence comes from correlating secret issuance with workload execution and revocation events, not from attestation alone. These controls tend to break down in highly dynamic CI/CD estates where identities are cloned across pipelines faster than ownership and expiry metadata can be updated.

Common Variations and Edge Cases

Tighter control often increases operational overhead, so organisations need to balance security precision against deployment speed and reliability. That tradeoff is especially visible when a single identity supports multiple applications, legacy jobs, or shared automation. In those environments, a strict one-identity-per-workload model may be ideal but difficult to deploy immediately, so best practice is evolving toward phased separation, stronger segmentation, and shorter token lifetimes first. Another edge case is certificate-heavy estates, where rotation is technically possible but operationally risky because legacy integrations fail if trust chains are not staged carefully. A related concern is third-party and embedded automation, where the organisation may not control the upstream issuance process. The Top 10 NHI Issues is a good reminder that visibility and lifecycle failures are often the real blockers, not policy language. If a team needs a quick proof point for prioritisation, the 2025 State of NHIs and Secrets in Cybersecurity reports that 91% of former employee tokens remain active after offboarding, which illustrates how badly periodic cleanup alone can miss live authority. The practical answer is to treat quarterly reviews as a backstop, then add runtime controls, revocation automation, and ownership checks for every high-impact NHI.

Related resources from NHI Mgmt Group

• How should security teams run access reviews for non-human identities?
• How should security teams govern non-human identities that have persistent access?
• When do NHI access reviews create more value than a one-time cleanup?
• What is the difference between reviewing human access and reviewing NHIs?