Access Reviews, Evidence, and Detection
Keep access justified over time by reviewing meaningful entitlements, recording evidence, and monitoring the events that change trust.
In this lesson, you will learn to:
- Define an access review and detection model that focuses attention on high-impact entitlements, meaningful evidence, and accountable remediation.
Access Reviews, Evidence, and Detection
This lesson connects periodic review with continuous detection and shows how to make governance a decision process rather than an attestation ritual.
Review access where the decision has consequences
Access review is the practice of asking whether an entitlement remains justified. Its value comes from the quality of the decision, not the number of attestations completed. A manager who sees an opaque group name and clicks “approve all” has created a record of activity, not evidence that access is appropriate.
Prioritize by impact and change. Privileged roles, access to sensitive datasets, finance approvals, external collaboration, dormant accounts, emergency roles, and service identities usually deserve more frequent or more expert review than low-risk general access. Present reviewers with enough context to decide: the identity owner, role meaning, resource scope, last use when relevant, request or approval source, expiry, and a clear revoke or modify action.
Separate certification from discovery. A review may confirm known access; it may not reveal an account that was never linked to the right owner, an inherited nested group, or a direct grant outside the normal path. Reconciliation against authoritative sources, periodic entitlement inventory, and targeted analysis of unusual access patterns complement manager review.
Close the loop. If a reviewer removes or modifies access, verify the downstream system actually reflects the decision. Track overdue reviews, unresolved conflicts, failed deprovisioning, and exceptions that repeatedly renew. Governance is ongoing risk reduction, not a quarterly document-collection event.
Monitor changes that alter trust, not only failed sign-ins
Failed sign-ins are useful telemetry, but identity detection cannot stop there. High-value events often occur after a successful sign-in: a new authenticator registration, recovery-method change, privileged-role assignment, consent grant, unusual service-principal credential, token use from a novel client, mass download, or a modification to logging and conditional-access policy.
Build detections as questions tied to response. “Which privileged roles were added outside an approved change window?” is more actionable than “alert on any role change.” Define the expected sources, fields, suppression conditions, owner, severity, and containment option. An alert that no team can investigate or act upon is a monitoring cost rather than a control.
Preserve context with privacy in mind. Event time, account or workload identity, actor, target, action, source service, result, approval reference, and correlation identifiers are often more useful than collecting every possible personal detail. Retention and access to identity telemetry should itself follow appropriate security, legal, and privacy requirements.
Review detection coverage after changes to the identity platform or applications. A migration can remove a log field, change a client identifier, or move an authorization decision to a different control plane. Treat identity monitoring as a product with tests and owners, not a set of rules that will remain accurate without care.
Resources
- CISA IAM Recommended Best Practices for Administrators — Use CISA’s administrator-focused IAM guide to inform identity inventory, access review, and operational control decisions.