GHSA-HMP2-4M7G-22CV

Vulnerability from github – Published: 2026-10-07 17:59 – Updated: 2026-10-07 17:59
VLAI
Summary
Backstage: Scaffolder action input authorization bypass
Details

Impact

An authenticated user with access to affected Scaffolder templates could bypass configured action restrictions. Depending on integration credentials, this could grant unauthorized access to repositories and related source-control resources.

Patches

Patched in @backstage/plugin-scaffolder-backend version 4.1.0

Workarounds

  • Restrict affected Scaffolder actions to trusted users and configure source-control integrations with least-privilege credentials.
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@backstage/plugin-scaffolder-backend"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.3.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@backstage/plugin-scaffolder-backend"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.4.0"
            },
            {
              "fixed": "3.4.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@backstage/plugin-scaffolder-backend"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "4.0.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@backstage/plugin-scaffolder-backend"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.4"
            },
            {
              "fixed": "4.1.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-106503"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-178",
      "CWE-284"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-07T17:59:08Z",
    "nvd_published_at": "2026-10-06T22:17:05Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nAn authenticated user with access to affected Scaffolder templates could bypass configured action restrictions. Depending on integration credentials, this could grant unauthorized access to repositories and related source-control resources.\n\n### Patches\n\nPatched in `@backstage/plugin-scaffolder-backend` version `4.1.0`\n\n### Workarounds\n\n- Restrict affected Scaffolder actions to trusted users and configure source-control integrations with least-privilege credentials.",
  "id": "GHSA-hmp2-4m7g-22cv",
  "modified": "2026-10-07T17:59:08Z",
  "published": "2026-10-07T17:59:08Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/security/advisories/GHSA-hmp2-4m7g-22cv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-106503"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/commit/11c1384c0649b8ab26391c6a4e4f34b80ab0d188"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/commit/a91ed72d540e80b62a73b39bb1563ff5018d52d1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/commit/e307e4f487103d815e484291b3fda778ab9983bf"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/backstage/backstage"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/releases/tag/v1.49.6"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/releases/tag/v1.50.5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/releases/tag/v1.54.6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Backstage: Scaffolder action input authorization bypass"
}



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