How to Audit Kubernetes RBAC Permissions to Enforce Least-Privilege Access

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Kubernetes RBAC provides a machine-readable record of every permission in a cluster, yet most clusters accumulate excessive grants over time through debugging sessions, default service accounts, and overly broad Helm charts. Auditors should first identify subjects bound to cluster-admin, those with cluster-wide Secret read access, and any bindings tied to system:authenticated or system:unauthenticated groups. The ability to create Pods or workload objects like Deployments and DaemonSets is a privilege-escalation risk, as it allows mounting service account tokens and running arbitrary code inside the cluster. Default ClusterRoles such as view, edit, and admin are built through label-based aggregation, meaning their effective permissions can expand silently when new ClusterRoles with matching labels are added. Service accounts mounted across many workloads multiply the blast radius of any single compromise, making service account scope and automounting controls critical audit checkpoints.

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