Backstage has improper authorization in GitLab organizational user ingestion

{
  "id": "bbf4cf1dc93887068d368ce4ef61a2e00576607b858e68ddb38326462761be38",
  "url": "https://osv.dev/vulnerability/GHSA-gp6m-x9vw-5c5x",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Backstage has improper authorization in GitLab organizational user ingestion",
    "summary": "### Impact Deployments that enable GitLab organization event ingestion and rely on scoped catalog users as an access boundary may admit an unintended catalog identity. Depending on sign-in and permission configuration, this may allow unauthorized access with the permissions of a standard authenticated user. ### Patches - Upgrade `@backstage/plugin-catalog-backend-module-gitlab` to version `0.8.7`. ### Workarounds - Disable event-driven GitLab organization ingestion and rely on scheduled discovery until upgrading. - Enforce organization membership independently at the authenticating proxy or sign-in resolver.",
    "evidence": "osv:GHSA-gp6m-x9vw-5c5x",
    "products": [
      {
        "name": {
          "value": "@backstage/plugin-catalog-backend-module-gitlab",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.8.7",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "GHSA-gp6m-x9vw-5c5x",
      "aliases": [
        "CVE-2026-106463",
        "GHSA-gp6m-x9vw-5c5x"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0.8.7"
                }
              ]
            }
          ],
          "package": {
            "name": "@backstage/plugin-catalog-backend-module-gitlab",
            "purl": "pkg:npm/%40backstage/plugin-catalog-backend-module-gitlab",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-gp6m-x9vw-5c5x/GHSA-gp6m-x9vw-5c5x.json"
          }
        }
      ],
      "modified": "2026-10-07T18:15:10.729437546Z",
      "provider": "osv",
      "references": [
        "https://github.com/backstage/backstage/security/advisories/GHSA-gp6m-x9vw-5c5x",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-106463",
        "https://github.com/backstage/backstage/commit/c211b4b67d28efd2f4fac63e35e2ac515e305cb3",
        "https://github.com/backstage/backstage",
        "https://github.com/backstage/backstage/releases/tag/v1.54.6"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-863"
        ],
        "severity": "MODERATE",
        "github_reviewed": true,
        "nvd_published_at": "2026-10-06T21:17:17Z",
        "github_reviewed_at": "2026-10-07T18:01:39Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-106463",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 97147,
  "published_at": "2026-10-07T18:01:39+00:00"
}