GHSA-44PX-QJJC-XRHQ

Vulnerability from github – Published: 2026-03-26 17:12 – Updated: 2026-08-06 21:56
VLAI
Summary
Craft CMS: Authorized asset "preview file" requests bypass allows users without asset access to retrieve private preview metadata
Details

Summary

An authenticated low-privileged user can call assets/preview-file for an asset they are not authorized to view and still receive preview response data (previewHtml) for that private asset.

The returned preview HTML included a private preview image route containing the target private assetId, even though canView was false for the attacker account.

Details

  1. assets/preview-file accepts a maliciously controlled assetId and renders preview output.
  2. The action does not enforce per-asset view authorization prior to returning preview content.
  3. As a result, an authenticated user without asset-view permission can still obtain private preview output.

This affects Craft installations with authenticated users of mixed privilege levels with private assets.

Resources

  • d30df3112220db1ffd6726a3ed11857014c7fb27
  • b1cddf72c98a
Severity
1.3 (Low)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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-2026-56385"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200",
      "CWE-639",
      "CWE-862"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-26T17:12:21Z",
    "nvd_published_at": null,
    "severity": "LOW"
  },
  "details": "### Summary\n\nAn authenticated low-privileged user can call `assets/preview-file` for an asset they are not authorized to view and still receive preview response data (`previewHtml`) for that private asset.\n\nThe returned preview HTML included a private preview image route containing the target private `assetId`, even though `canView` was `false` for the attacker account.\n\n### Details\n\n1. `assets/preview-file` accepts a maliciously controlled `assetId` and renders preview output.\n2. The action does not enforce per-asset view authorization prior to returning preview content.\n 3. As a result, an authenticated user without asset-view permission can still obtain private preview output.\n\nThis affects Craft installations with authenticated users of mixed privilege levels with private assets.\n\n### Resources\n\n- d30df3112220db1ffd6726a3ed11857014c7fb27\n- b1cddf72c98a",
  "id": "GHSA-44px-qjjc-xrhq",
  "modified": "2026-08-06T21:56:28Z",
  "published": "2026-03-26T17:12:21Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms/security/advisories/GHSA-44px-qjjc-xrhq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56385"
    },
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms/commit/b1cddf72c98a66801beb04ea4b07e72182b7b7db"
    },
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms/commit/d30df3112220db1ffd6726a3ed11857014c7fb27"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/craftcms/cms"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/craft-cms-authorization-bypass-in-assets-preview-file-endpoint"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Craft CMS: Authorized asset \"preview file\" requests bypass allows users without asset access to retrieve private preview metadata"
}



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