GHSA-QGVJ-QCF8-XQ73

Vulnerability from github – Published: 2026-10-07 17:59 – Updated: 2026-10-07 17:59
VLAI
Summary
Backstage: Improper URL validation in catalog entity placeholder resolution
Details

Impact

An authenticated Backstage user could craft a catalog entity with placeholder directives that reference resources outside the entity's source repository. Under certain configurations, this could allow access to data not intended to be available to the user.

Patches

Patched in @backstage/plugin-catalog-backend version 3.9.1

Workarounds

If you're not able to update immediately:

  • Limit the scope of integration credentials (e.g., GitHub tokens) to only the repositories that Backstage needs to access.
Severity
7.7 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@backstage/plugin-catalog-backend"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.9.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-106498"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863",
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-07T17:59:24Z",
    "nvd_published_at": "2026-10-06T22:17:04Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nAn authenticated Backstage user could craft a catalog entity with placeholder directives that reference resources outside the entity\u0027s source repository. Under certain configurations, this could allow access to data not intended to be available to the user.\n\n### Patches\n\nPatched in `@backstage/plugin-catalog-backend` version `3.9.1`\n\n### Workarounds\n\nIf you\u0027re not able to update immediately:\n\n- Limit the scope of integration credentials (e.g., GitHub tokens) to only the repositories that Backstage needs to access.",
  "id": "GHSA-qgvj-qcf8-xq73",
  "modified": "2026-10-07T17:59:24Z",
  "published": "2026-10-07T17:59:24Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/security/advisories/GHSA-qgvj-qcf8-xq73"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-106498"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/commit/0b0f6fc89b4eb4872c76a498abbe1dc65998bb6e"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/commit/286bfc1f9cc3608a073b41016be302785be385d1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/commit/61a10f19926aeda7f4a32de48d733e6710584634"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/commit/99729e925fd2bd40ba210022351a0ee6318e6197"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/commit/e786ac309ed2d775daf2309393c015c43902d6f6"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/backstage/backstage"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/releases/tag/v1.49.6"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/releases/tag/v1.50.5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/releases/tag/v1.51.3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/releases/tag/v1.53.2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/releases/tag/v1.54.6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Backstage: Improper URL validation in catalog entity placeholder resolution"
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.