{"id":"CVE-2026-61682","sourceIdentifier":"security-advisories@github.com","published":"2026-09-18T16:17:07.523","lastModified":"2026-09-24T21:25:27.050","vulnStatus":"Deferred","cveTags":[],"descriptions":[{"lang":"en","value":"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."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"kcp-dev","product":"kcp","versions":[{"version":"< 0.31.4","status":"affected"},{"version":">= 0.32.0, < 0.32.2","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","baseScore":9.9,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.1,"impactScore":6.0}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-18T19:24:33.782681Z","id":"CVE-2026-61682","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-290"},{"lang":"en","value":"CWE-302"},{"lang":"en","value":"CWE-348"}]}],"references":[{"url":"https://github.com/kcp-dev/kcp/commit/7437cdcfec8f927d1a9bf1b2dd1e075d038e27ca","source":"security-advisories@github.com"},{"url":"https://github.com/kcp-dev/kcp/commit/f913ee890fb2fd9fa78e50c43474b078bfb6aeff","source":"security-advisories@github.com"},{"url":"https://github.com/kcp-dev/kcp/releases/tag/v0.31.4","source":"security-advisories@github.com"},{"url":"https://github.com/kcp-dev/kcp/releases/tag/v0.32.2","source":"security-advisories@github.com"},{"url":"https://github.com/kcp-dev/kcp/security/advisories/GHSA-c8w2-fgvx-vhv4","source":"security-advisories@github.com"}]}