{"cve":"CVE-2026-61682","nvd":{"published":"2026-09-18T16:17:07.523","modified":"2026-09-24T21:25:27.050","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"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},"cwes":["CWE-290","CWE-302","CWE-348"],"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"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:55:23.253742848+00:00"},"epss":{"cve":"CVE-2026-61682","score":0.00384,"percentile":0.32454,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-c8w2-fgvx-vhv4","url":"https://osv.dev/vulnerability/GHSA-c8w2-fgvx-vhv4","summary":"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","modified":"2026-09-28T17:11:09.141356782Z","packages":[{"ecosystem":"Go","name":"github.com/kcp-dev/kcp","purl":"pkg:golang/github.com/kcp-dev/kcp","ranges":["<0.31.4"],"fixed":["0.31.4"]},{"ecosystem":"Go","name":"github.com/kcp-dev/kcp","purl":"pkg:golang/github.com/kcp-dev/kcp","ranges":[">=0.32.0 <0.32.2"],"fixed":["0.32.2"]}]},{"id":"GO-2026-6517","url":"https://osv.dev/vulnerability/GO-2026-6517","summary":"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","modified":"2026-09-28T17:00:16.350676379Z","packages":[{"ecosystem":"Go","name":"github.com/kcp-dev/kcp","purl":"pkg:golang/github.com/kcp-dev/kcp","ranges":["<0.31.4",">=0.32.0 <0.32.2"],"fixed":["0.31.4","0.32.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}