Observed data showing how an identity is actually being used in production rather than how it was originally granted. For machine and autonomous identities, runtime evidence helps distinguish active, justified access from stale or excessive entitlements.
What Runtime Usage Evidence Actually Shows
Runtime usage evidence is not a grant record or an inventory snapshot. It is observed production activity that shows whether an identity is being exercised in real workloads, with real frequency, and for real purposes.
For machine and autonomous identities, that distinction matters because unused access can look legitimate on paper long after it stops being operationally necessary. runtime evidence helps separate an active dependency from a dormant entitlement.
Why Runtime Evidence Matters for Access Decisions
The practical value of runtime evidence is that it ties authorization to actual behaviour. It can show whether a service account, API principal, or agent credential is repeatedly used, rarely used, or never used, which makes it easier to judge whether access still reflects the current system design.
This is especially useful when environments change faster than the entitlement model. A role may remain assigned after an integration is retired, or a workload may move to a new path while its older access stays open.
How Runtime Evidence Differs From Static Entitlements
Static entitlements answer what an identity may do; runtime evidence answers what it actually does. Those are related but not interchangeable views, and mature identity governance uses both because either one alone can mislead.
A clean permission review can still miss stale access if the identity has not been used for weeks, and a busy identity can still be overprivileged if it only exercises a small subset of what it is allowed to do. Runtime data gives the operational reality behind the paper entitlement.
What Good Runtime Evidence Typically Includes
Useful runtime evidence is usually specific enough to connect an identity to a production action, such as a service calling an API, a workload accessing a secret, or an automation agent invoking a tool. The strongest evidence is time-bound, attributable, and tied to a clear source system.
At the control level, this kind of evidence often sits alongside broader NIST SP 800-53 Rev 5 Security and Privacy Controls for auditability and access control, while NIST Cybersecurity Framework 2.0 gives a broader governance context for identifying, protecting and detecting identity-related activity. For machine and non-human access patterns, OWASP Non-Human Identity Top 10 is a useful reference point for why runtime visibility matters.
Risk and Threat Considerations
Runtime usage evidence matters because stale, excessive, or invisible access creates a security blind spot. If no one can show how an identity is being used in production, dormant access can linger long after the original business need has disappeared.
Failure mechanism: The gap between granted access and actual runtime behaviour allows overprivileged identities, abandoned credentials, and hidden dependencies to persist without review.
Impact: Attackers or insiders can abuse that lingering access for persistence, lateral movement, or unauthorized actions, and defenders may miss the exposure until a compromise or outage forces a closer look.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST SP 800-53 Rev 5, NIST CSF 2.0 and CIS Controls v8 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | AU-6 — Audit Review, Analysis, and Reporting | Runtime evidence depends on reviewing observed access activity. |
| AC-2 — Account Management | Runtime evidence informs whether accounts are still needed and properly governed. | |
| IA-5 — Authenticator Management | Observed runtime use helps govern credentials, tokens, and other authenticators over time. | |
| Recommendation — Review production usage logs to validate whether access remains justified. Use observed usage to recertify, disable, or retire accounts with no active need. Track authenticator usage to identify stale or excessive credential exposure. | ||
| NIST CSF 2.0 | ID.AM-01 — Physical devices and systems within the organization are inventoried | Runtime evidence strengthens the inventory of active identities and their operational footprint. |
| Recommendation — Correlate observed identity activity with the authoritative inventory to find dormant access. | ||
| CIS Controls v8 | CIS-5 — Account Management | Runtime evidence supports account review and removal of inactive access paths. |
| Recommendation — Use usage evidence to remove or tighten accounts that no longer support production work. | ||
Practitioner Guidance
What to watch for: Treat runtime evidence as the practical check on entitlement hygiene. If an identity is granted broad access but only uses a narrow set of actions, that is a signal to revisit scope, ownership, and expiry rather than assume the entitlement model is accurate by default.
Governance implication: Runtime evidence is most valuable when it is reviewed as part of access recertification, exception handling, and offboarding decisions. For machine and autonomous identities, the question is not just whether the identity exists, but whether its current production behaviour still justifies the access it holds.