Zero trust scoring for NHI: measuring progress, not just risk

At a glance

What this is: This is Clutch Security’s case for splitting NHI measurement into risk and zero trust scores, because remediation can improve dashboards while static credential sprawl still grows.

Why it matters: IAM, PAM, and NHI teams need a way to tell whether controls are reducing future identity exposure, not only clearing current findings.

Context

Zero trust scoring for NHI is a measurement problem first and a tooling problem second. Standard risk scores can fall while the identity estate keeps accumulating static API keys, service accounts, and hardcoded credentials that expand future exposure.

The governance gap is that remediation tracks present defects, while architecture maturity tracks whether those defects are being created less often. For NHI programmes, that distinction matters because the control objective is not only to fix findings, but to reduce the conditions that keep producing them.

Key questions

Q: How can security teams tell whether NHI governance is working?

A: They should look for fewer orphaned accounts, shorter credential lifetimes, lower secret reuse and faster decommissioning when systems or projects end. If credentials still survive after business purpose has ended, the governance model is not controlling the lifecycle effectively.

Q: Why can a better risk score still mean higher identity exposure?

A: Because a risk score can improve when existing problems are fixed even if new static credentials are being added faster than old ones are removed. That produces a false sense of progress. The organisation looks cleaner operationally, but the number of long-lived identity objects that can later be abused continues to grow.

Q: What is the difference between remediation and NHI maturity?

A: Remediation is the act of fixing current findings. NHI maturity is whether the architecture is changing so those findings are less likely to recur. A mature programme reduces standing exposure, limits credential persistence, and governs new identities consistently. A remediation-only programme can still leave the same conditions in place.

Q: When should organisations prioritise zero trust scoring over risk scoring?

A: They should prioritise zero trust scoring when leadership needs to know whether the identity model is becoming structurally safer, not just whether today’s issues are being closed. Risk scoring remains useful for operational response, but zero trust scoring becomes critical when static credential sprawl, governance gaps, or programme reporting make improvement hard to prove.

Technical breakdown

Why risk scoring can hide credential sprawl

Risk scoring is inherently reactive. It only registers identities that are already overprivileged, stale, exposed, or misconfigured, so teams can lower the score by fixing findings while new static credentials are still being created elsewhere. In NHI environments, that creates a denominator problem: the stock of service accounts, API keys, and hardcoded credentials can grow faster than remediated findings shrink. The result is a healthier-looking dashboard with a larger attack surface underneath it.

Practical implication: Track static credential growth separately from remediated risk so the score does not mask expansion in the identity estate.

What zero trust scoring measures in NHI estates

Zero trust scoring measures architectural progression, not just incident cleanup. It places each non-human identity on a maturity spectrum from static, long-lived credentials with no behavioural governance to tightly governed identities or ephemeral credential models that remove standing exposure. That makes the metric useful for asking whether the environment is moving toward less persistent trust, fewer reusable secrets, and less privilege accumulation over time. The score is therefore about direction of travel, not a snapshot of current defects.

Practical implication: Use the score to evaluate whether identity design is reducing standing exposure, not merely reducing open tickets.

How dual scoring separates remediation from maturity

A dual-score model distinguishes between stopping the bleeding and healing the wound. Risk score reflects how many current problems are being remediated. Zero trust score reflects whether the underlying architecture is becoming less dependent on static credentials and more dependent on governance, ephemerality, and reduced persistence. When both improve together, the programme is clearing findings and shrinking future exposure. When they diverge, remediation is outpacing structural change, which means the environment is still producing the same class of NHI risk.

Practical implication: Review both scores together so executives can see whether controls are fixing symptoms or changing the identity model.

NHI Mgmt Group analysis

Risk scores alone do not prove that an NHI programme is becoming safer. They prove that known findings are being reduced, which is a different outcome. If static credentials continue to proliferate, the organisation can look better on paper while the underlying identity architecture becomes more fragile. Practitioners should treat risk reduction as necessary but insufficient.

Static credential accumulation is the structural problem this metric exposes. Static, long-lived credentials are the condition that turns every new service account or API key into future exposure. Clutch Security’s split between remediation and zero trust progression correctly separates present-state cleanup from architectural direction. The implication is that governance must measure whether persistence itself is shrinking.

Zero trust maturity for NHIs is a lifecycle question, not a point-in-time finding. If identities can still be created with long-lived secrets, copied credentials, or unmanaged privileges, the estate is not moving toward zero trust even if individual risks are resolved. That is why maturation metrics matter alongside remediation metrics. Teams need to judge whether the identity model is changing, not just whether findings are closed.

Ephemeral credential drift: This is the named concept the article surfaces, even if indirectly. Organisations may think they are advancing because exposure reports improve, but the real test is whether static credential dependence is shrinking across the estate. Practitioners should use that lens to distinguish architectural progress from reportable hygiene.

Board reporting needs both operational and structural measures. One metric answers whether current issues are under control. The other answers whether the organisation is producing fewer issues over time. That separation is increasingly important for zero trust programmes because leadership needs evidence of direction, not just evidence of cleanup.

From our research library:

• 90% of IT leaders say properly managing NHIs is essential for a successful zero-trust implementation, according to the Ultimate Guide to NHIs.
• NHIs outnumber human identities by 25x to 50x in modern enterprises, according to the Ultimate Guide to NHIs.
• Read next: Zero Trust Identity Guide

What this signals

Zero trust scoring changes the governance question from ‘what is broken now?’ to ‘are we creating fewer future identity risks?’ That matters because NHI programmes often optimise for visible remediation while leaving the underlying credential model intact. The practical signal is whether static secrets, service accounts, and hardcoded credentials are declining across the estate, not just whether open findings are closing.

Identity architecture has to become measurable as a direction of travel. A programme that cannot separate cleanup from structural progress will overstate its maturity. Security leaders should expect measurement models to show whether the estate is moving away from long-lived credential dependence and toward governed or ephemeral identity patterns.

For practitioners

• Separate remediation from maturity tracking Keep a risk score for current findings and a zero trust score for architectural progression so leaders do not confuse cleanup with design change.
• Measure static credential growth independently Track new API keys, service accounts, and hardcoded credentials as a separate exposure trend, not as part of the same remediation dashboard.
• Segment scores by owner and identity type Break results out by application owner, service account class, and environment so teams can see where static credential dependence is still being created.
• Use zero trust scoring for executive reporting Report whether the identity architecture is becoming less dependent on long-lived secrets and more governed, rather than only reporting open risk items.

Key takeaways

• NHI risk scores can improve even when the identity estate is still adding static API keys, service accounts, and hardcoded credentials.
• The meaningful measure is whether the architecture is reducing future exposure, not only closing current findings.
• Teams need separate signals for remediation and maturity if they want to prove structural progress toward zero trust.

Key terms

• Zero Trust Score: A zero trust score is a maturity measure that reflects how far an environment has moved away from persistent, reusable trust. For non-human identities, it helps show whether the estate is shrinking static credential dependence and adopting tighter lifecycle control.
• Risk Score: A risk score is a point-in-time measure of what is currently exposed or misconfigured in an identity environment. In NHI programmes it is useful for remediation, but it does not tell you whether the architecture is becoming safer over time or just clearing today’s backlog.
• Static Credential: A static credential is a long-lived secret such as an API key, password, token, or certificate that exists outside the moment of use. It creates persistent attack surface because it can be copied, stored, reused, and exposed across code, pipelines, configuration files, and third-party environments.
• Credential Sprawl: Credential sprawl is the uncontrolled accumulation of machine secrets, keys, and tokens across systems, teams, and environments. It usually starts with a single use case and ends with overlapping permissions, unclear ownership, and a larger attack surface than the organisation expected.

Deepen your knowledge

NHI governance, agentic AI identity, and machine identity lifecycle are core topics in our NHI Foundation Level course, the industry's only accredited NHI security programme. If you are responsible for identity security strategy or NHI governance in your organisation, it is worth exploring.