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CVE-2019-11247: API server allows access to custom resources via wrong scope #80983
The API server mistakenly allows access to a cluster-scoped custom resource if the request is made as if the resource were namespaced. Authorizations for the resource accessed in this manner are enforced using roles and role bindings within the namespace, meaning that a user with access only to a resource in one namespace could create, view update or delete the cluster-scoped resource (according to their namespace role privileges).
Mitigations prior to upgrading:
@kbruner GKE customers will have patched versions to upgrade to, please see this bulletin: