CVE-2026-71208 KubeSphere: SSRF via Unvalidated Cluster CRD Connection Endpoint in Cluster Reconciliation

KubeSphere's cluster-controller reconciliation pkg/utils/clusterclient/clusterclient.go, addCluster processes every Cluster custom resource's connection configuration and immediately calls Discovery.ServerVersion against the CRD-specified Kubernetes API endpoint, which is parsed only for URL synt...