A customized approach lets an organisation design controls that meet a security objective without using the exact prescriptive method in the standard. In PCI DSS v4.0, that flexibility only works if the organisation can demonstrate the control is effective, measurable, and auditable in practice.
Expanded Definition
A customized approach is a control design method that allows an organisation to meet a security objective without copying the exact prescriptive safeguard written in the standard. In PCI DSS v4.0, the idea is not to relax the objective but to prove an alternative control is equally effective, measurable, and auditable. That makes the term especially important in NHI security, where rigid control templates may not fit service accounts, API keys, ephemeral tokens, or agentic workflows.
Definitions vary across vendors and audit programs, but the core expectation is consistent: the organisation must show how the alternative control works, how it is tested, and how evidence is retained. This aligns well with outcome-focused governance in the NIST Cybersecurity Framework 2.0, where the emphasis is on measurable security outcomes rather than box-ticking.
The most common misapplication is treating a customized approach as a waiver, which occurs when teams substitute a different control but fail to document equivalent effectiveness, auditability, and ongoing monitoring.
Examples and Use Cases
Implementing a customized approach rigorously often introduces documentation and validation overhead, requiring organisations to weigh flexibility against the cost of proving equivalence to auditors and internal risk owners.
- A platform team replaces a prescriptive manual credential review with automated entitlement analytics for service accounts, provided the review cadence, exception handling, and evidence trail are demonstrably stronger.
- An organisation uses short-lived workload identities instead of a fixed vault rotation workflow, but only after proving issuance, revocation, and monitoring controls meet the same objective.
- A CI/CD environment enforces policy-as-code for secret injection and token scoping instead of a checklist-based approval process, with logs retained for audit and incident response.
- An agentic AI system uses constrained tool access and approval gates rather than broad standing permissions, reflecting guidance in the Ultimate Guide to NHIs and implementation patterns discussed in the NIST Cybersecurity Framework 2.0.
- A third-party integration uses federated identity assertions in place of locally stored API keys, as long as the assertion trust model and monitoring controls are documented and testable.
These examples reflect a broader NHI governance reality described in the Ultimate Guide to NHIs: organisations often need more than one control pattern to manage diverse machine identities safely.
Why It Matters in NHI Security
Customized approaches matter because NHI environments rarely resemble the human authentication scenarios that many standards were originally written around. A control that is technically compliant on paper can still fail in practice if it does not account for ephemeral workloads, automated credential issuance, or rapid offboarding needs. That gap is where abuse often begins.
NHI Mgmt Group research shows that only 5.7% of organisations have full visibility into their service accounts, which makes evidence-based control design even more important. If a team cannot see where identities exist, it cannot credibly claim that a customized control is operating effectively. The real governance value is not the alternate method itself, but the ability to demonstrate that the objective remains enforced under change, scale, and incident pressure.
Organisations typically encounter the need for a customized approach only after an audit finding, a failed control test, or a breach exposes that the original prescriptive method did not fit the environment, at which point the term becomes operationally unavoidable to address.
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 surface, NIST CSF 2.0 set the technical controls, and PCI DSS v4.0 define the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-02 | Alternative control design must still prevent secret sprawl and unauthorized NHI exposure. |
| NIST CSF 2.0 | GV.OC, PR.AC | Outcome-based governance and access control support justified deviations from prescriptive methods. |
| PCI DSS v4.0 | Customized Approach | PCI DSS v4.0 explicitly allows equivalent controls when effectiveness can be demonstrated. |
Prove the custom control preserves NHI-02 outcomes through evidence, testing, and continuous monitoring.
Related resources from NHI Mgmt Group
- How should organizations approach the governance of AI agents?
- Why do APIs need a different approach than user authentication for post-quantum readiness?
- When does OIDC federation work better than a vault-based approach?
- Why do identity systems need a different recovery approach than normal servers?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on June 12, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
