{"id":"EUVD-2026-83043","revision":null,"records":[{"revision":"50261969590146a4839f45f4d24e5292","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-61682","aliases":[],"title":"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","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.","state":0,"publishedAt":"2026-09-18T16:11:46.443+00:00","modifiedAt":"2026-09-21T20:50:17.494+00:00","affected":[{"ecosystem":"Vendor product","name":"kcp","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"kcp-dev\",\n                    \"product\": \"kcp\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 0.31.4\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 0.32.0, < 0.32.2\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":9.9,"severity":"CRITICAL"}],"references":["https://github.com/kcp-dev/kcp/security/advisories/GHSA-c8w2-fgvx-vhv4","https://github.com/kcp-dev/kcp/commit/7437cdcfec8f927d1a9bf1b2dd1e075d038e27ca","https://github.com/kcp-dev/kcp/commit/f913ee890fb2fd9fa78e50c43474b078bfb6aeff","https://github.com/kcp-dev/kcp/releases/tag/v0.31.4","https://github.com/kcp-dev/kcp/releases/tag/v0.32.2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-61682","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-61682","identifiers":["CVE-2026-61682"]},"retained":false,"historicalAffected":[]},{"revision":"9107d41d17bc41d3927a2c013bc18d68","observedAt":"2026-11-11T15:02:57.353+00:00","statement":{"source":"euvd","id":"EUVD-2026-83043","aliases":["CVE-2026-61682","GHSA-c8w2-fgvx-vhv4"],"title":"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-* iden…","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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":9.9,"severity":null}],"references":["https://github.com/kcp-dev/kcp/security/advisories/GHSA-c8w2-fgvx-vhv4","https://github.com/kcp-dev/kcp/commit/7437cdcfec8f927d1a9bf1b2dd1e075d038e27ca","https://github.com/kcp-dev/kcp/commit/f913ee890fb2fd9fa78e50c43474b078bfb6aeff","https://github.com/kcp-dev/kcp/releases/tag/v0.31.4","https://github.com/kcp-dev/kcp/releases/tag/v0.32.2"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-83043","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Sep 18, 2026, 4:11:46 PM","dateUpdated":"Sep 21, 2026, 8:50:17 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-83043","identifiers":["EUVD-2026-83043","CVE-2026-61682","GHSA-c8w2-fgvx-vhv4"]},"retained":false,"historicalAffected":[]},{"revision":"d56ac1f5f5f94a2ba161fad4f87634ea","observedAt":"2026-10-25T14:19:22.811+00:00","statement":{"source":"nvd","id":"CVE-2026-61682","aliases":[],"title":"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-* iden…","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.","state":0,"publishedAt":"2026-09-18T16:17:07.523+00:00","modifiedAt":"2026-09-24T21:25:27.05+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":9.9,"severity":"CRITICAL"}],"references":["https://github.com/kcp-dev/kcp/commit/7437cdcfec8f927d1a9bf1b2dd1e075d038e27ca","https://github.com/kcp-dev/kcp/commit/f913ee890fb2fd9fa78e50c43474b078bfb6aeff","https://github.com/kcp-dev/kcp/releases/tag/v0.31.4","https://github.com/kcp-dev/kcp/releases/tag/v0.32.2","https://github.com/kcp-dev/kcp/security/advisories/GHSA-c8w2-fgvx-vhv4"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-61682","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-290","CWE-302","CWE-348"],"productCriteria":[],"sourceDates":{"published":"2026-09-18T16:17:07.523","lastModified":"2026-09-24T21:25:27.050"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-61682","identifiers":["CVE-2026-61682"]},"retained":false,"historicalAffected":[]},{"revision":"90b0a42f3fcb44e5bdc7f1ecfd9c2d0c","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-c8w2-fgvx-vhv4","aliases":["CVE-2026-61682","GO-2026-6517"],"title":"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","description":"# Summary\n\nThe 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 escalate to cluster administrator (`system:masters`) and read, write, or delete resources in any workspace on the shard. This is a complete multi-tenant isolation and authorization bypass.\n\n## Impact \n\nIn a sharded kcp deployment, external clients reach shards through the front-proxy, which authenticates the client and then forwards the resulting identity to the shard using Kubernetes request-header authentication (`X-Remote-User` / `X-Remote-Group` / `X-Remote-Extra-*`). The shard trusts these headers because they arrive over the front-proxy's mutually-authenticated connection.\n\nBecause the front-proxy appended its identity headers instead of replacing them — and never removed any copies the client sent — an authenticated attacker could smuggle forged identity headers through to the shard. With this, an attacker holding any ordinary credential (client certificate, OIDC token, or service-account token) and no special privileges could:\n\n- assert `X-Remote-Group: system:masters` and act as cluster super-user, bypassing the entire kcp authorizer chain in every workspace on the shard;\n- forge `authorization.kcp.io/warrant` to assume an arbitrary user/group identity via kcp's delegated-identity mechanism;\n- forge `authentication.kcp.io/scopes` to escape the cluster-scoping that confines service-account and impersonated identities to their origin workspace;\n- satisfy per-workspace required-group gating by injecting the required group.\n\nThe result is arbitrary read/write/delete access to any tenant's resources, secrets, RBAC, APIExports/APIBindings, and LogicalClusters — a cross-workspace access break and authorizer bypass across the proxy's trust boundary.\n\n\n# Patches\nFixed in v0.31.4, 0.32.2. The front-proxy and the shard's in-process local-proxy now unconditionally remove any inbound `X-Remote-*` identity headers before stamping the authenticated identity, so no client-supplied value can be forwarded to a shard.\n\nOperators should upgrade to a patched release. No configuration changes are required after upgrading.\n\n# Workarounds\n\nThere is no complete workaround other than upgrading. Deployments that terminate client connections at an external proxy capable of stripping `X-Remote-User`, `X-Remote-Group`, and all `X-Remote-Extra-*` headers from inbound requests before they reach the kcp front-proxy can mitigate exposure in the interim.\n\nCredit to [5ud0er](https://github.com/5ud0er) / Tarmo Technologies.","state":0,"publishedAt":"2026-09-18T17:15:49+00:00","modifiedAt":"2026-09-28T17:11:09.1413568+00:00","affected":[{"ecosystem":"Go","name":"github.com/kcp-dev/kcp","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.31.4"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/kcp-dev/kcp","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0.32.0"},{"kind":"fixed","version":"0.32.2"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"CRITICAL"}],"references":["https://github.com/kcp-dev/kcp/security/advisories/GHSA-c8w2-fgvx-vhv4","https://github.com/kcp-dev/kcp/commit/7437cdcfec8f927d1a9bf1b2dd1e075d038e27ca","https://github.com/kcp-dev/kcp","https://github.com/kcp-dev/kcp/releases/tag/v0.31.4","https://github.com/kcp-dev/kcp/releases/tag/v0.32.2"],"sourceUrl":"https://github.com/advisories/GHSA-c8w2-fgvx-vhv4","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-c8w2-fgvx-vhv4","identifiers":["GHSA-c8w2-fgvx-vhv4","CVE-2026-61682","GO-2026-6517"]},"retained":false,"historicalAffected":[]},{"revision":"4db88b9f8f774f5bbf653e425743d14e","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-6517","aliases":["CVE-2026-61682","GHSA-c8w2-fgvx-vhv4"],"title":"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 in github.com/kcp-dev/kcp","description":"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 in github.com/kcp-dev/kcp","state":0,"publishedAt":"2026-09-28T16:43:40+00:00","modifiedAt":"2026-09-28T17:00:16.3506764+00:00","affected":[{"ecosystem":"Go","name":"github.com/kcp-dev/kcp","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.31.4"},{"kind":"introduced","version":"0.32.0"},{"kind":"fixed","version":"0.32.2"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/kcp-dev/kcp/security/advisories/GHSA-c8w2-fgvx-vhv4","https://github.com/kcp-dev/kcp/commit/7437cdcfec8f927d1a9bf1b2dd1e075d038e27ca","https://github.com/kcp-dev/kcp/releases/tag/v0.31.4","https://github.com/kcp-dev/kcp/releases/tag/v0.32.2"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-6517","license":"OSV · upstream source license applies","key":"osv:GO-2026-6517","identifiers":["GO-2026-6517","CVE-2026-61682","GHSA-c8w2-fgvx-vhv4"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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