They often outnumber human accounts, carry elevated permissions, and are harder to track across hybrid systems. When they are not rotated, vaulted, or tied to clear ownership, they become durable access paths that attackers can abuse long after the original business need has changed.
Why This Matters for Security Teams
Service accounts, API keys, certificates, and other NHIs expand exposure because they are often created for speed, then left in place with broad access and weak ownership. That creates durable paths into production systems, pipelines, and third-party integrations. NHI Mgmt Group notes that NHIs outnumber human identities by 25x to 50x in modern enterprises, which means even small control gaps scale quickly across environments. The risk is not just volume, but persistence and reach.
When these identities are not tied to a clear business owner, they can survive staff changes, cloud migrations, and application rewrites. They also tend to be embedded in code, CI/CD, and automation where manual review is rare. For background on how this shows up in practice, see the Ultimate Guide to NHIs — Why NHI Security Matters Now and the 52 NHI Breaches Analysis. In practice, many security teams discover the exposure only after a secret has already been reused, leaked, or inherited by an application no one still owns.
How It Works in Practice
The exposure grows because most NHIs are operational identities, not interactive ones. They authenticate machine-to-machine, often with long-lived credentials, and they are used by scripts, workloads, build agents, and integrations that need uninterrupted access. If the secret is copied into code, a pipeline variable, a container image, or a forgotten vault entry, the identity becomes hard to inventory and even harder to revoke cleanly.
That is why lifecycle control matters as much as initial issuance. Current guidance suggests treating NHI management as an ongoing process: discover the identity, map it to an owner, classify what it can reach, rotate or replace the credential, and remove it when the workload changes. NHI Mgmt Group research shows that only 5.7% of organisations have full visibility into their service accounts, and only 20% have formal offboarding and revocation processes. Those gaps explain why service accounts become hidden persistence mechanisms.
- Use vaulting and rotation so credentials are not permanently embedded in applications.
- Assign explicit ownership so every service account has a named team accountable for review and revocation.
- Reduce standing privilege by limiting each identity to the minimum systems, APIs, and datasets it actually needs.
- Continuously inventory secrets in code, configs, CI/CD, and runtime environments.
Implementation is strongest when paired with zero trust principles and workload-specific controls. The Guide to the Secret Sprawl Challenge is useful context for the operational mess that often surrounds these identities, while Anthropic’s report on AI-orchestrated cyber espionage illustrates how automated actors can amplify credential misuse at machine speed. These controls tend to break down when legacy applications require static secrets that cannot be rotated without service disruption because teams then delay remediation indefinitely.
Common Variations and Edge Cases
Tighter control over NHIs often increases operational overhead, requiring organisations to balance resilience against deployment speed and legacy compatibility. That tradeoff is especially visible in environments with old middleware, third-party SaaS integrations, or batch jobs that cannot easily adopt modern workload identity.
Best practice is evolving, but there is no universal standard for every environment. Some teams move quickly to short-lived credentials and automated rotation, while others maintain limited static secrets under strict monitoring until refactoring is possible. Either way, the core question is whether the identity is still needed, still owned, and still constrained.
Edge cases also appear in shared service accounts, emergency break-glass access, and vendor-managed integrations. Those accounts can be necessary, but they should be exception-based, logged, and reviewed more aggressively than ordinary workload identities. The The 52 NHI breaches Report shows how recurring failures often stem from the same pattern: long-lived access, poor visibility, and weak offboarding. For a broader reference point, the Ultimate Guide to NHIs — What are Non-Human Identities remains a practical baseline for lifecycle, rotation, and ownership decisions.
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 | Directly addresses weak rotation and long-lived NHI credentials. |
| NIST CSF 2.0 | PR.AC-4 | Maps to least-privilege access management for machine identities. |
| NIST AI RMF | Useful where autonomous systems create or use NHIs dynamically. |
Rotate service account secrets on a schedule and replace static credentials with short-lived alternatives.
Related resources from NHI Mgmt Group
- Why do service accounts and other non-human identities create hidden risk in IAM programmes?
- Why do service accounts and other non-human identities increase breach impact?
- Why do non-human identities create more risk than many human accounts?
- Why do non-human identities create more remediation risk than many human accounts?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on June 23, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
