Maturity Model

Expanded Definition

A maturity model is a staged assessment tool that describes how far a capability has progressed from ad hoc practice to repeatable, governed, and measurable operations. In NHI security, it is used to evaluate access governance, secret handling, lifecycle automation, and visibility across workloads, service accounts, API keys, and certificates.

Unlike a simple checklist, a maturity model compares current-state operations against an intended target state and helps teams prioritise what to improve next. Guidance varies across vendors, but the useful versions of the model are always concrete: each stage should map to observable controls, evidence, and outcomes. NIST frames this kind of capability improvement through the NIST Cybersecurity Framework 2.0, which is why maturity scoring is most valuable when it drives action rather than producing a decorative score.

The most common misapplication is treating maturity as a one-time label, which occurs when teams score themselves without linking the result to control ownership, remediation milestones, and reassessment.

Examples and Use Cases

Implementing a maturity model rigorously often introduces assessment overhead, requiring organisations to weigh sharper prioritisation against the time needed to gather evidence and maintain consistent scoring.

• An IAM team maps service account onboarding, rotation, and deprovisioning into stages so it can see whether process discipline is still manual, partially automated, or policy-driven.
• A security leader uses the model to compare NHI visibility across business units, then identifies where secrets are stored in code, CI/CD pipelines, or unmanaged vaults.
• A platform group benchmarks its current-state controls against the Ultimate Guide to NHIs and the NIST operating model to define a practical target for rotation, least privilege, and offboarding.
• A GRC team uses maturity scoring to show executives why hybrid and multi-cloud access governance is lagging, then sequences improvements by risk and dependency.
• A Zero Trust programme uses maturity stages to decide whether non-human identities are still treated as static trust objects or as continuously evaluated workloads.

Why It Matters in NHI Security

Maturity models matter because NHI risk usually emerges from operational inconsistency, not from a single isolated failure. NHIs outnumber human identities by 25x to 50x in modern enterprises, and that scale makes informal governance collapse quickly when secrets, lifecycle events, and permissions are managed differently across systems.

The Ultimate Guide to NHIs reports that only 5.7% of organisations have full visibility into their service accounts, which shows why maturity assessments are often the first honest signal of exposure. They help teams distinguish between merely having controls and actually operating them consistently. That distinction matters because a maturity gap often hides excessive privileges, stale secrets, and missing offboarding steps that remain invisible until an audit, incident, or vendor compromise forces the issue.

Organisations typically encounter the practical need for a maturity model only after a breach review exposes fragmented NHI ownership, at which point staged improvement becomes operationally unavoidable to address.

Related resources from NHI Mgmt Group

• Shared Responsibility Model
• What is the difference between maturity and compliance in the Essential Eight model?
• When should teams introduce AppSec in a cloud maturity model?
• NHI Maturity Model