{"id":"CVE-2026-61682","published":"2026-09-18T16:17:07.523","lastModified":"2026-09-24T21:25:27.050","description":"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 authenticated tenant can inject X-Remote-Group: system:masters, authorization.kcp.io/warrant, authentication.kcp.io/scopes, or a group used for per-workspace required-group gating, and the shard trusts these values as authenticated identity assertions. This allows cross-workspace impersonation, authorization bypass, and arbitrary reading, writing, or deletion of resources, secrets, RBAC data, APIExports, APIBindings, and LogicalClusters. This issue is fixed in versions 0.31.4 and 0.32.2.","cvssScore":9.9,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","cwes":["CWE-290","CWE-302","CWE-348"],"vendors":[],"products":[],"references":[{"url":"https://github.com/kcp-dev/kcp/commit/7437cdcfec8f927d1a9bf1b2dd1e075d038e27ca","tags":[]},{"url":"https://github.com/kcp-dev/kcp/commit/f913ee890fb2fd9fa78e50c43474b078bfb6aeff","tags":[]},{"url":"https://github.com/kcp-dev/kcp/releases/tag/v0.31.4","tags":[]},{"url":"https://github.com/kcp-dev/kcp/releases/tag/v0.32.2","tags":[]},{"url":"https://github.com/kcp-dev/kcp/security/advisories/GHSA-c8w2-fgvx-vhv4","tags":[]}],"exploitRefs":[{"url":"https://github.com/kcp-dev/kcp/commit/7437cdcfec8f927d1a9bf1b2dd1e075d038e27ca","tags":[]},{"url":"https://github.com/kcp-dev/kcp/commit/f913ee890fb2fd9fa78e50c43474b078bfb6aeff","tags":[]},{"url":"https://github.com/kcp-dev/kcp/releases/tag/v0.31.4","tags":[]},{"url":"https://github.com/kcp-dev/kcp/releases/tag/v0.32.2","tags":[]},{"url":"https://github.com/kcp-dev/kcp/security/advisories/GHSA-c8w2-fgvx-vhv4","tags":[]}],"hasPoc":true,"ai":{"summary":"The flaw allows cross-workspace impersonation and authorization bypass, enabling arbitrary resource manipulation.","exploitability":"Exploitation is relatively straightforward for any authenticated tenant with write access to identity headers.","blast_radius":"Real-world impact is high, allowing full control over resources across workspaces.","remediation":"Upgrade to kcp version 0.31.4 or 0.32.2.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["auth-bypass","rbac","kubernetes","identity","workspaces"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-27T08:57:54.978Z"}}