GHSA-3X3Q-GHCP-WHF7

Vulnerability from github – Published: 2025-08-15 18:43 – Updated: 2025-09-26 17:19
VLAI?
Summary
Template Secret leakage in logs in Scaffolder when using `fetch:template`
Details

A logging flaw in Backstage Scaffolder’s fetch:template action up to @backstage/plugin-scaffolder-backend 2.1.0 may write template secrets to logs. The action emitted a duplicate, pre-redaction copy of input parameters, so values provided via the {{ secrets }} bag could appear in local/server logs when the action ran. Exploitation requires use of the secrets argument and access to Scaffolder/build logs; integrity and availability are unaffected.

  • Fix: upgrade to 2.1.1, which removes the duplicate log path and ensures secrets are redacted.
  • Mitigation: avoid passing {{ secrets }} to fetch:template if upgrade is not possible.

Open an issue in the Backstage repository

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Severity ?
2.6 (Low)
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:N/A:N
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.1.0"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@backstage/plugin-scaffolder-backend"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-55285"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-532"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-08-15T18:43:16Z",
    "nvd_published_at": "2025-08-15T18:15:27Z",
    "severity": "LOW"
  },
  "details": "A logging flaw in Backstage Scaffolder\u2019s `fetch:template` action up to `@backstage/plugin-scaffolder-backend` **2.1.0** may write template secrets to logs. The action emitted a duplicate, pre-redaction copy of input parameters, so values provided via the `{{ secrets }}` bag could appear in local/server logs when the action ran. Exploitation requires use of the `secrets` argument and access to Scaffolder/build logs; integrity and availability are unaffected.\n\n*   **Fix:** upgrade to `2.1.1`, which removes the duplicate log path and ensures secrets are redacted.\n*   **Mitigation:** avoid passing `{{ secrets }}` to `fetch:template` if upgrade is not possible.\n\n\u003e Open an issue in the [Backstage repository](https://github.com/backstage/backstage)\n\u003e\n\u003e Visit our Discord, linked to in [Backstage README](https://github.com/backstage/backstage)",
  "id": "GHSA-3x3q-ghcp-whf7",
  "modified": "2025-09-26T17:19:17Z",
  "published": "2025-08-15T18:43:16Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/security/advisories/GHSA-3x3q-ghcp-whf7"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-55285"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/commit/c371f6fe12371de31dca537510e6653e287cdc2e"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/backstage/backstage"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Template Secret leakage in logs in Scaffolder when using `fetch:template`"
}


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