kcp front-proxy does not strip inbound X-Remote-* identity headers, allowing any authenticated client to inject groups/warrants and impersonate system:masters in any workspace

Summary The kcp front-proxy fails to strip client-supplied identity headers before forwarding requests to shards. Any authenticated tenant can inject their own X-Remote-Group and X-Remote-Extra- headers, which the shard trusts as a verified identity assertion — allowing a low-privilege user to...

CVE-2026-61682

kcp is a Kubernetes-like control plane for form-factors and use-cases beyond Kubernetes and container workloads. Prior to 0.31.4 and 0.32.2, the kcp front-proxy does not remove inbound X-Remote-User, X-Remote-Group, or X-Remote-Extra- identity headers before forwarding requests to shards. Any...

CVE-2026-61682

kcp is a Kubernetes-like control plane. Prior to 0.31.4 and 0.32.2 , the kcp front-proxy does not strip inbound X-Remote-User, X-Remote-Group, or X-Remote-Extra-* identity headers before forwarding requests to shards. An authenticated tenant can inject headers such as X-Remote-Group: system:maste...

EUVD-2026-83043

kcp is a Kubernetes-like control plane for form-factors and use-cases beyond Kubernetes and container workloads. Prior to 0.31.4 and 0.32.2, the kcp front-proxy does not remove inbound X-Remote-User, X-Remote-Group, or X-Remote-Extra- identity headers before forwarding requests to shards. Any...