Vulnerabilities in pkg:npm/@backstage/plugin-scaffolder-backend

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-29gx-h2m3-xw44",
  "modified" : "2026-10-07T18:01:54Z",
  "published" : "2026-10-07T18:01:53Z",
  "aliases" : [ "CVE-2026-106462" ],
  "summary" : "Backstage's scaffolder credential handling may allow unintended GitHub authentication fallback",
  "details" : "### Impact\n\nScaffolder actions that interact with source control systems may not consistently enforce the intended credential boundaries under certain configurations. An authenticated user could perform operations with broader access than intended.\n\n### Patches\n\n- `@backstage/plugin-scaffolder-backend` version `4.1.0`\n- `@backstage/plugin-scaffolder-backend-module-azure` version `0.2.25`\n- `@backstage/plugin-scaffolder-backend-module-bitbucket-cloud` version `0.3.10`\n- `@backstage/plugin-scaffolder-backend-module-bitbucket-server` version `0.2.25`\n- `@backstage/plugin-scaffolder-backend-module-github` version `0.9.13`\n- `@backstage/plugin-scaffolder-backend-module-gitlab` version `0.11.10`\n\nThe fix introduces a new configuration option that enforces user-provided credentials for supported SCM actions. The new behavior is opt-in for compatibility. After upgrading, set:\n\n```yaml\nscaffolder:\n  requireScmUserCredentials: true\n```\n\nBefore enabling this setting, review and update your templates as described in the software templates documentation referred to below.\n\n### Workarounds\n\nIf you cannot upgrade and enable the setting immediately:\n\n- Restrict who can create Scaffolder tasks and which templates they can execute.\n- Limit SCM integration credentials to the minimum repository read and mutation permissions required.\n- Remove integration credentials for SCM hosts where all required operations can use explicitly supplied user tokens.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@backstage/plugin-scaffolder-backend"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.1.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@backstage/plugin-scaffolder-backend-module-github"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.9.13"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@backstage/plugin-scaffolder-backend-module-gitlab"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.11.10"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@backstage/plugin-scaffolder-backend-module-azure"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.2.25"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@backstage/plugin-scaffolder-backend-module-bitbucket-cloud"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.3.10"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@backstage/plugin-scaffolder-backend-module-bitbucket-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.2.25"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/backstage/backstage/security/advisories/GHSA-29gx-h2m3-xw44"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-106462"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/backstage/backstage/commit/6fb2a41ea47da37eafe5ea744050"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/backstage/backstage/commit/6fb2a41ea47da37eafe5ea744050ef90be6820c0"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/backstage/backstage"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/backstage/backstage/releases/tag/v1.54.6"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-441", "CWE-863" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-10-07T18:01:53Z",
    "nvd_published_at" : "2026-10-06T21:17:17Z"
  }
}