CVE-2025-29781: Bare Metal Operator (BMO) can expose any secret from other namespaces via BMCEventSubscription CRD

The Bare Metal Operator (BMO) implements a Kubernetes API for managing bare metal hosts in Metal3.

Baremetal Operator enables users to load Secret from arbitrary namespaces upon deployment of the namespace scoped Custom Resource BMCEventSubscription (BMCES). An adversary Kubernetes account with only namespace level roles (e.g. a tenant controlling a namespace) may create a BMCES in their authorized namespace and then load Secrets from their unauthorized namespaces to their authorized namespace via the Baremetal Operator controller’s cluster scoped privileges, causing Secret leakage.