Backstage: Improper input validation in Confluence to Markdown scaffolder module

{
  "id": "2c82fdceb03e51233f50ce1122962dbd950ea60c2ece23d3446e9d239aebdc95",
  "url": "https://osv.dev/vulnerability/GHSA-75qf-886x-5xf2",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Backstage: Improper input validation in Confluence to Markdown scaffolder module",
    "summary": "### Impact Insufficient input validation in the Confluence to Markdown scaffolder module could allow an attacker to influence file write operations during template execution. Exploitation requires a Backstage user to run a template that processes attacker-influenced Confluence content. ### Patches Patched in `@backstage/plugin-scaffolder-backend-module-confluence-to-markdown` version `0.3.25` ### Workarounds If unable to update immediately: - Restrict Confluence edit access to trusted users. - Review Confluence page content before running scaffolder templates against untrusted pages.",
    "evidence": "osv:GHSA-75qf-886x-5xf2",
    "products": [
      {
        "name": {
          "value": "@backstage/plugin-scaffolder-backend-module-confluence-to-markdown",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.3.25",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "GHSA-75qf-886x-5xf2",
      "aliases": [
        "CVE-2026-106559",
        "GHSA-75qf-886x-5xf2"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0.3.25"
                }
              ]
            }
          ],
          "package": {
            "name": "@backstage/plugin-scaffolder-backend-module-confluence-to-markdown",
            "purl": "pkg:npm/%40backstage/plugin-scaffolder-backend-module-confluence-to-markdown",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-75qf-886x-5xf2/GHSA-75qf-886x-5xf2.json"
          }
        }
      ],
      "modified": "2026-10-07T18:15:12.760429318Z",
      "provider": "osv",
      "references": [
        "https://github.com/backstage/backstage/security/advisories/GHSA-75qf-886x-5xf2",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-106559",
        "https://github.com/backstage/backstage/commit/506c2c11bce3ed9d1f8f50de5d6474b16e43a65e",
        "https://github.com/backstage/backstage",
        "https://github.com/backstage/backstage/releases/tag/v1.54.6"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-22",
          "CWE-73"
        ],
        "severity": "MODERATE",
        "github_reviewed": true,
        "nvd_published_at": "2026-10-07T15:17:17Z",
        "github_reviewed_at": "2026-10-07T18:03:06Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-106559",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 97167,
  "published_at": "2026-10-07T18:03:06+00:00"
}