Why do static service accounts and API keys keep undermining NHI programmes?

Why This Matters for Security Teams

Static service accounts and api key keep undermining NHI programmes because they turn access into something durable, copyable, and easy to forget. Once a key is embedded in code, shared across pipelines, or reused by multiple services, it becomes difficult to prove who or what is still using it. That is exactly how dormant access survives remediation cycles and reappears in incident reviews. NHIMG’s research on the Guide to the Secret Sprawl Challenge shows how secrets tend to multiply faster than teams can govern them.

The control problem is not just “weak secrets hygiene.” It is lifecycle failure: long-lived credentials outlive the workload, accumulate permissions, and bypass the review rigor that human identities usually receive. Security teams often treat these credentials as implementation details, yet they become the fastest path to persistent access, lateral movement, and untracked privilege. Current guidance in the NIST Cybersecurity Framework 2.0 points toward stronger governance and continuous monitoring, but many environments still lack inventory, ownership, and expiry discipline for non-human access. In practice, many security teams encounter the blast radius only after a leaked key has already been reused across systems.

How It Works in Practice

Effective NHI programmes reduce dependence on static secrets and replace them with workload identity plus short-lived authorisation. The practical goal is to bind access to the workload that is actually executing, not to a credential that can be copied elsewhere. That usually means a combination of workload identity, policy-as-code, and just-in-time issuance. A service proves what it is through cryptographic identity, then receives only the access needed for a specific task window.

This is where most legacy IAM patterns break down. Service accounts are often created once, granted broad rights, and then left untouched because they are “just machine identities.” API keys are even worse when they are reused across environments or embedded in build systems. By contrast, runtime-controlled access can be evaluated per request using context such as workload, destination, time, and intent. The 2024 Non-Human Identity Security Report found that only 19.6% of security professionals expressed strong confidence in securely managing non-human workload identities, which reflects the scale of the operational gap.

• Issue short-lived credentials per task, then revoke them automatically when the job completes.
• Use workload identity as the primary primitive, rather than reusable shared secrets.
• Map each service account to an owner, purpose, and expiry date so access can be reviewed.
• Rotate or eliminate keys that are copied into source code, CI logs, or deployment manifests.
• Evaluate access at request time with policy controls, not only at provisioning time.

This model aligns with the direction of identity governance in standards such as the NIST Cybersecurity Framework 2.0, but implementation maturity varies widely. These controls tend to break down in brittle legacy applications that cannot tolerate frequent token renewal or that depend on shared secrets across many downstream systems.

Common Variations and Edge Cases

Tighter secret control often increases operational overhead, requiring organisations to balance reduced exposure against deployment complexity and application compatibility. That tradeoff is real, especially where vendors, scripts, and older platforms assume a long-lived API key will remain valid indefinitely. Best practice is evolving, but there is no universal standard for this yet across every infrastructure pattern.

Some environments still need transitional exceptions. For example, a third-party integration may not support workload identity, or a regulated batch process may require a temporary bridge while the platform is modernised. In those cases, the safest pattern is to isolate the secret, scope it narrowly, and make its expiry visible to the team that owns the dependency. NHIMG’s 52 NHI Breaches Analysis and Top 10 NHI Issues both reinforce the same pattern: most failures are not caused by a single bad key, but by weak lifecycle governance around many keys.

The exception is not the strategy. The exception is a temporary compatibility gap that should be tracked, time-boxed, and removed. Where organisations keep static credentials because “nothing else works,” those exceptions quietly become the permanent architecture.

Related resources from NHI Mgmt Group

• What problem does ownership attribution solve for service accounts and API keys?
• Why do service accounts matter in DSPM programmes?
• What is the difference between role-based access and API key governance for NHI security?
• How should security teams govern API keys used for generative AI access?