Backstage has incorrect authorization in search engine permission filtering

{
  "id": "17a6267c038d5185f546fba25c011f6eff6ffceaa9c94dd73b7bb631ce817e42",
  "url": "https://osv.dev/vulnerability/GHSA-9325-vq29-gp3v",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Backstage has incorrect authorization in search engine permission filtering",
    "summary": "### Impact An authenticated Backstage user subject to a `DENY` policy for search document types could receive search results they were not authorized to view. This affects deployments with `permission.enabled: true` and an Elasticsearch or OpenSearch search backend. ### Patches - Upgrade `@backstage/plugin-search-backend` to 2.1.6 - Upgrade `@backstage/plugin-search-backend-module-elasticsearch` to 1.8.7 ### Workarounds If you are unable to upgrade immediately: - Temporarily modify permission policies to use `CONDITIONAL` decisions with per-result filtering rather than blanket `DENY` for search document types - Restrict Elasticsearch/OpenSearch index access at the cluster level so that the search service account can only reach expected Backstage indices, limiting the blast radius if the authorization bypass is triggered.",
    "evidence": "osv:GHSA-9325-vq29-gp3v",
    "products": [
      {
        "name": {
          "value": "@backstage/plugin-search-backend",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.1.6",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "@backstage/plugin-search-backend-module-elasticsearch",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.8.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "GHSA-9325-vq29-gp3v",
      "aliases": [
        "CVE-2026-106562",
        "GHSA-9325-vq29-gp3v"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.1.6"
                }
              ]
            }
          ],
          "package": {
            "name": "@backstage/plugin-search-backend",
            "purl": "pkg:npm/%40backstage/plugin-search-backend",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-9325-vq29-gp3v/GHSA-9325-vq29-gp3v.json"
          }
        },
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.8.7"
                }
              ]
            }
          ],
          "package": {
            "name": "@backstage/plugin-search-backend-module-elasticsearch",
            "purl": "pkg:npm/%40backstage/plugin-search-backend-module-elasticsearch",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-9325-vq29-gp3v/GHSA-9325-vq29-gp3v.json"
          }
        }
      ],
      "modified": "2026-10-07T18:15:11.183397966Z",
      "provider": "osv",
      "references": [
        "https://github.com/backstage/backstage/security/advisories/GHSA-9325-vq29-gp3v",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-106562",
        "https://github.com/backstage/backstage/commit/2d5d3e77d630455d6d48cfa8f31fd3c126fd6f29",
        "https://github.com/backstage/backstage",
        "https://github.com/backstage/backstage/releases/tag/v1.54.1"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-754",
          "CWE-863"
        ],
        "severity": "MODERATE",
        "github_reviewed": true,
        "nvd_published_at": "2026-10-07T15:17:17Z",
        "github_reviewed_at": "2026-10-07T18:02:52Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-106562",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 97152,
  "published_at": "2026-10-07T18:02:52+00:00"
}