GHSA-5PGF-H923-M958

Vulnerability from github – Published: 2026-03-24 16:59 – Updated: 2026-03-25 21:00
VLAI?
Summary
Craft CMS may expose private assets through anonymous "generate transform" calls via transform URL
Details

Summary

An unauthenticated user can call assets/generate-transform with a private assetId, receive a valid transform URL, and fetch transformed image bytes.

The endpoint is anonymous and does not enforce per-asset authorization before returning the transform URL.

Details

Root cause: - Anonymous endpoint accepts user-controlled asset reference. - It creates and returns a transform URL for that asset without checking access rights. - If the transform output is reachable, guest users can read content derived from private assets.

Who is impacted:

  • Installations where private source assets can be transformed and transform URLs are reachable.

Security consequence:

  • Anonymous users can obtain content derived from private assets without authentication.

Resources

https://github.com/craftcms/cms/commit/7290d91639e

Severity ?
2.7 (Low)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 5.9.13"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "craftcms/cms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0.0-RC1"
            },
            {
              "fixed": "5.9.14"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.17.7"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "craftcms/cms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0-RC1"
            },
            {
              "fixed": "4.17.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-33160"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-639",
      "CWE-862"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-24T16:59:58Z",
    "nvd_published_at": "2026-03-24T18:16:10Z",
    "severity": "LOW"
  },
  "details": "### Summary\n\nAn unauthenticated user can call `assets/generate-transform` with a private `assetId`, receive a valid transform URL, and fetch transformed image bytes.\n\nThe endpoint is anonymous and does not enforce per-asset authorization before returning the transform URL.\n\n### Details\n\nRoot cause:\n- Anonymous endpoint accepts user-controlled asset reference.\n- It creates and returns a transform URL for that asset without checking access rights.\n- If the transform output is reachable, guest users can read content derived from private assets.\n\nWho is impacted:\n\n- Installations where private source assets can be transformed and transform URLs are reachable.\n\nSecurity consequence:\n\n  - Anonymous users can obtain content derived from private assets without authentication.\n\n### Resources\n\nhttps://github.com/craftcms/cms/commit/7290d91639e",
  "id": "GHSA-5pgf-h923-m958",
  "modified": "2026-03-25T21:00:12Z",
  "published": "2026-03-24T16:59:58Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms/security/advisories/GHSA-5pgf-h923-m958"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33160"
    },
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms/commit/7290d91639e5e3a4f7e221dfbef95c9b77331860"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/craftcms/cms"
    },
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms/releases/tag/4.17.8"
    },
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms/releases/tag/5.9.14"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Craft CMS may expose private assets through anonymous \"generate transform\" calls via transform URL"
}


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