Backstage: Unsupported catalog cluster authentication mode in kubernetes backend

{
  "id": "2ad261f9baa48d870d0c0062c004c24311b4409dbfc74b2be1d31a650ebb39ec",
  "url": "https://osv.dev/vulnerability/GHSA-h53x-hjx6-25gr",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Backstage: Unsupported catalog cluster authentication mode in kubernetes backend",
    "summary": "### Impact 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. ### Patches Patched in `@backstage/plugin-kubernetes-backend` version `0.21.10` ### Workarounds - Do not configure service account authentication through catalog-provided clusters; use the supported static configuration method when service account authentication is required. - Restrict catalog ingestion so untrusted users cannot create or alter Kubernetes cluster Resource entities.",
    "evidence": "osv:GHSA-h53x-hjx6-25gr",
    "products": [
      {
        "name": {
          "value": "@backstage/plugin-kubernetes-backend",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.21.10",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "low",
    "structured": {
      "id": "GHSA-h53x-hjx6-25gr",
      "aliases": [
        "CVE-2026-106487",
        "GHSA-h53x-hjx6-25gr"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0.21.10"
                }
              ]
            }
          ],
          "package": {
            "name": "@backstage/plugin-kubernetes-backend",
            "purl": "pkg:npm/%40backstage/plugin-kubernetes-backend",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-h53x-hjx6-25gr/GHSA-h53x-hjx6-25gr.json"
          }
        }
      ],
      "modified": "2026-10-07T18:15:12.170259633Z",
      "provider": "osv",
      "references": [
        "https://github.com/backstage/backstage/security/advisories/GHSA-h53x-hjx6-25gr",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-106487",
        "https://github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311e28946",
        "https://github.com/backstage/backstage",
        "https://github.com/backstage/backstage/releases/tag/v1.54.6"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-441"
        ],
        "severity": "LOW",
        "github_reviewed": true,
        "nvd_published_at": "2026-10-06T21:17:17Z",
        "github_reviewed_at": "2026-10-07T18:01:08Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-106487",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 97162,
  "published_at": "2026-10-07T18:01:08+00:00"
}