Backstage: Sensitive information exposure in Scaffolder

{
  "id": "7249c5d9c6b053113e69abec264f7c05a20caff7f54d8eb745c4f6702d53e56a",
  "url": "https://osv.dev/vulnerability/GHSA-g2v8-7jhw-pp8p",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Backstage: Sensitive information exposure in Scaffolder",
    "summary": "### Impact An authenticated Backstage user who can read another user's Scaffolder task may receive internal execution data. In deployments where that data contains credentials for an external service, this may permit disclosure and unauthorized changes in that external service. ### Patches Patched in `@backstage/plugin-scaffolder-backend` version `4.1.0` ### Workarounds - Configure `scaffolder.task.read` with the `isTaskOwner` condition so users can only read tasks they created. - Restrict affected integrations and workflows to trusted operators until an upgrade is available.",
    "evidence": "osv:GHSA-g2v8-7jhw-pp8p",
    "products": [
      {
        "name": {
          "value": "@backstage/plugin-scaffolder-backend",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "3.3.1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "@backstage/plugin-scaffolder-backend",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "3.4.1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "@backstage/plugin-scaffolder-backend",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.0.3",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "@backstage/plugin-scaffolder-backend",
          "evidence": "/affected/3/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.1.0",
            "evidence": "/affected/3/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "GHSA-g2v8-7jhw-pp8p",
      "aliases": [
        "CVE-2026-106501",
        "GHSA-g2v8-7jhw-pp8p"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "3.3.1"
                }
              ]
            }
          ],
          "package": {
            "name": "@backstage/plugin-scaffolder-backend",
            "purl": "pkg:npm/%40backstage/plugin-scaffolder-backend",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-g2v8-7jhw-pp8p/GHSA-g2v8-7jhw-pp8p.json"
          }
        },
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "3.4.0"
                },
                {
                  "fixed": "3.4.1"
                }
              ]
            }
          ],
          "package": {
            "name": "@backstage/plugin-scaffolder-backend",
            "purl": "pkg:npm/%40backstage/plugin-scaffolder-backend",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-g2v8-7jhw-pp8p/GHSA-g2v8-7jhw-pp8p.json"
          }
        },
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "4.0.0"
                },
                {
                  "fixed": "4.0.3"
                }
              ]
            }
          ],
          "package": {
            "name": "@backstage/plugin-scaffolder-backend",
            "purl": "pkg:npm/%40backstage/plugin-scaffolder-backend",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-g2v8-7jhw-pp8p/GHSA-g2v8-7jhw-pp8p.json"
          }
        },
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "4.0.4"
                },
                {
                  "fixed": "4.1.0"
                }
              ]
            }
          ],
          "package": {
            "name": "@backstage/plugin-scaffolder-backend",
            "purl": "pkg:npm/%40backstage/plugin-scaffolder-backend",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-g2v8-7jhw-pp8p/GHSA-g2v8-7jhw-pp8p.json"
          }
        }
      ],
      "modified": "2026-10-07T18:15:10.728715918Z",
      "provider": "osv",
      "references": [
        "https://github.com/backstage/backstage/security/advisories/GHSA-g2v8-7jhw-pp8p",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-106501",
        "https://github.com/backstage/backstage/commit/66d2219edf0abe33ab7d0c1ced5d069d1e065be5",
        "https://github.com/backstage/backstage/commit/c19838870476a8e29144c84b1a5ac0654ec20fb5",
        "https://github.com/backstage/backstage/commit/e262d649981ff99bb01ca7077807ae3e25e85560",
        "https://github.com/backstage/backstage",
        "https://github.com/backstage/backstage/releases/tag/v1.49.6",
        "https://github.com/backstage/backstage/releases/tag/v1.50.5",
        "https://github.com/backstage/backstage/releases/tag/v1.54.6"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-200",
          "CWE-201"
        ],
        "severity": "CRITICAL",
        "github_reviewed": true,
        "nvd_published_at": "2026-10-06T22:17:05Z",
        "github_reviewed_at": "2026-10-07T17:59:19Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-106501",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 97146,
  "published_at": "2026-10-07T17:59:19+00:00"
}