A control that checks whether a user or account has actually used a specific application or permission set within a defined period. It helps distinguish active access from dormant access, which is essential for reducing stale entitlements, tightening least privilege, and making review decisions based on evidence rather than assumption.
Expanded Definition
Usage verification is a review control that confirms whether an identity, application entitlement, or permission set has been exercised within a defined time window. In NHI governance, it helps separate actively used access from access that is merely assigned, which is especially important for service accounts, API keys, workload identities, and delegated agent permissions.
Unlike simple recertification, usage verification is evidence-driven: it asks for observable activity, such as authenticated calls, job execution, token use, or tool invocation. That distinction matters because dormant access can look legitimate on paper even when it is no longer required in production. Industry usage varies, and no single standard governs this yet, so organisations should define their own usage thresholds, review periods, and acceptable evidence sources. NHI Management Group treats usage verification as a practical control for reducing entitlement drift and supporting Zero Trust-aligned decisions, as discussed in the Ultimate Guide to NHIs and in the broader direction of the NIST Cybersecurity Framework 2.0.
The most common misapplication is treating assignment as proof of need, which occurs when reviewers approve access without checking whether the identity actually used it during the review period.
Examples and Use Cases
Implementing usage verification rigorously often introduces monitoring and evidence-collection overhead, requiring organisations to weigh stronger least-privilege decisions against the cost of telemetry, log retention, and review effort.
- A CI/CD service account has database write access, but logs show no write activity for 90 days, so the permission is flagged for removal.
- An AI agent holds tool access to a ticketing system, and usage verification checks whether the agent actually invoked that tool during the current quarter.
- A deployment pipeline rotates between several API keys, and the review confirms which keys were used versus which remain assigned but idle.
- A cloud workload identity is granted access to a storage bucket, but telemetry shows only read operations from a different role, indicating the bucket permission is stale.
- A privileged automation account is reviewed against evidence from access logs and job records, aligning the decision with the governance approach described in the Ultimate Guide to NHIs and the access-governance principles in NIST Cybersecurity Framework 2.0.
Why It Matters in NHI Security
Usage verification matters because NHIs often accumulate access faster than teams can rationalise it. When an identity is not actively used, its permissions become pure exposure: if the credential is stolen, misconfigured, or inherited by an agent, the unused entitlement still expands blast radius. This is why evidence-based review is central to reducing stale access, especially where service accounts and secrets are difficult to inventory.
NHI Management Group reports that 80% of identity breaches involved compromised non-human identities such as service accounts and API keys. That statistic underscores a simple governance point: dormant access is not harmless, it is often an unexamined control gap. Usage verification also supports Zero Trust operations by forcing access decisions to reflect current behaviour rather than historical assignment, which aligns with the intent of NIST Cybersecurity Framework 2.0 and adjacent identity governance practices.
Organisations typically encounter the cost of weak usage verification only after a breach review, when previously unneeded entitlements are found to have remained active long after the underlying workload, integration, or agent behaviour changed.
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 and OWASP Agentic AI Top 10 address the attack and risk surface, while NIST CSF 2.0, NIST Zero Trust (SP 800-207) and NIST SP 800-63 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-01 | Usage verification helps identify dormant NHI permissions and reduce entitlement sprawl. |
| NIST CSF 2.0 | PR.AA-01 | Identity and access management controls support evidence-based access decisions. |
| NIST Zero Trust (SP 800-207) | Zero Trust requires continuous evaluation of access based on current context and need. | |
| NIST SP 800-63 | IAL2 | Identity assurance guidance informs how confidently an account's current use can be tied to a known identity. |
| OWASP Agentic AI Top 10 | A-04 | Agentic systems need verified tool usage to prevent overbroad delegated access. |
Require strong identity proofing where usage evidence drives access decisions for privileged accounts.
Related resources from NHI Mgmt Group
- What makes GenAI usage part of the same secrets problem?
- Why is it crucial to adopt new authentication methods in MCP usage?
- How should organisations handle identity verification when deepfakes can mimic real users?
- What is the difference between probabilistic and deterministic identity verification?
