{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.54.6"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0e67bc1fc88fba3a8cb716d3584cef05ecbcf9a8"
            }
          ],
          "repo": "https://github.com/backstage/backstage",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-h53x-hjx6-25gr"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-441"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106487.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "fixed": "0.21.10"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Backstage is an open framework for building developer portals. Prior to 0.21.10, the @backstage/plugin-kubernetes-backend package is affected by unsupported catalog cluster authentication mode in kubernetes backend. Deployments using catalog cluster discovery may be affected when catalog contributors can create or modify kubernetes-cluster Resource entities. With the required endpoint permissions and pod RBAC, the backend can use its local in-cluster identity, potentially exposing Kubernetes resources readable by that identity. The credential is used only with the local in-cluster API endpoint and is not sent to the catalog-supplied endpoint. This issue is fixed in version 0.21.10.",
  "id": "CVE-2026-106487",
  "modified": "2026-10-07T10:30:39.897979350Z",
  "published": "2026-10-06T20:36:45.419Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106487.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311e28946"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/releases/tag/v1.54.6"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/backstage/backstage/security/advisories/GHSA-h53x-hjx6-25gr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-106487"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Backstage: Unsupported catalog cluster authentication mode in kubernetes backend"
}