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...

CVE-2026-61682 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

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...

HTTP Request Smuggling

Overview Affected versions of this package are vulnerable to HTTP Request Smuggling via the soupmessageheadersgetonecommon is used to construct the request URI. An attacker can bypass host-based access controls or poison caches by sending requests with multiple Host headers, exploiting the...

grafana: Escalation from admin to server admin when auth proxy is used

A flaw was found in the grafana package. Auth proxy allows authentication of a user by only providing the username or email in an X-WEBAUTH-USER HTTP header. The trust assumption is that a front proxy will take care of authentication and that the Grafana server is only publicly reachable with thi...

CVE-2022-35957

A flaw was found in the grafana package. Auth proxy allows authentication of a user by only providing the username or email in an X-WEBAUTH-USER HTTP header. The trust assumption is that a front proxy will take care of authentication and that the Grafana server is only publicly reachable with thi...