CVE-2026-71208: Kubesphere

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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 syntax (url.Parse) with no allow/deny-list for loopback, RFC1918 private ranges, link-local, or cloud-metadata addresses (e.g. 169.254.169.254).

Affected products

• Kubesphere Kubesphere: from 4.0.0, up to and including 4.1.3-rc.0

Published 2026-08-05. Last modified 2026-08-26.