{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.31.4"
              },
              {
                "introduced": "0.32.0"
              },
              {
                "fixed": "0.32.2"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7437cdcfec8f927d1a9bf1b2dd1e075d038e27ca"
            },
            {
              "introduced": "857068adc705066996fe9bbff21c0cb08382b5a6"
            },
            {
              "fixed": "f913ee890fb2fd9fa78e50c43474b078bfb6aeff"
            }
          ],
          "repo": "https://github.com/kcp-dev/kcp",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-c8w2-fgvx-vhv4"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-290",
      "CWE-302",
      "CWE-348"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61682.json"
  },
  "details": "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.",
  "id": "CVE-2026-61682",
  "modified": "2026-09-19T03:30:22.961085425Z",
  "published": "2026-09-18T16:11:46.443Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61682.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/kcp-dev/kcp/commit/7437cdcfec8f927d1a9bf1b2dd1e075d038e27ca"
    },
    {
      "type": "FIX",
      "url": "https://github.com/kcp-dev/kcp/commit/f913ee890fb2fd9fa78e50c43474b078bfb6aeff"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kcp-dev/kcp/releases/tag/v0.31.4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kcp-dev/kcp/releases/tag/v0.32.2"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/kcp-dev/kcp/security/advisories/GHSA-c8w2-fgvx-vhv4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-61682"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "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"
}