GHSA-C43V-4CR8-6MVP

Vulnerability from github – Published: 2026-07-09 13:44 – Updated: 2026-08-06 21:58
VLAI
Summary
Craft CMS has authenticated path traversal in `assets/icon`, allowing local `.svg` file read
Details

Summary

An authenticated path traversal in assets/icon allows local SVG file read by passing traversal sequences in the extension parameter. The issue is caused by file existence checks happening before extension validation.

Details

The endpoint: - src/controllers/AssetsController.php:1115-1123 - actionIcon(string $extension) calls Assets::iconPath($extension) and returns sendFile($path, ...).

In Assets::iconPath(): - Path is built from user-controlled extension: - src/helpers/Assets.php:906-909 - If file_exists($path) is true, path is returned immediately: - src/helpers/Assets.php:910-912

Validation exists in Assets::iconSvg(): - preg_match('/^\w+$/', $extension) - src/helpers/Assets.php:927-931

However, that validation is only reached if iconPath() does not find a file. So traversal payloads that resolve to existing .svg files bypass validation and are served by sendFile().

Impact

  • Authenticated users can read local .svg files accessible to the application process.

References

  • https://github.com/craftcms/cms/commit/30f5f1a8d6edf0f3a00be72c42c78d9dc7d72d5c
Severity
2.0 (Low)
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.17.6"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "craftcms/cms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0-RC1"
            },
            {
              "fixed": "4.17.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 5.9.12"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "craftcms/cms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0.0-RC1"
            },
            {
              "fixed": "5.9.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-56394"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-09T13:44:06Z",
    "nvd_published_at": null,
    "severity": "LOW"
  },
  "details": "### Summary\n\nAn authenticated path traversal in `assets/icon` allows local SVG file read by passing traversal sequences in the `extension` parameter. The issue is caused by file existence checks happening before extension validation.\n\n### Details\nThe endpoint:\n- `src/controllers/AssetsController.php:1115-1123`\n- `actionIcon(string $extension)` calls `Assets::iconPath($extension)` and returns `sendFile($path, ...)`.\n\nIn `Assets::iconPath()`:\n- Path is built from user-controlled `extension`:\n  - `src/helpers/Assets.php:906-909`\n- If `file_exists($path)` is true, path is returned immediately:\n  - `src/helpers/Assets.php:910-912`\n\nValidation exists in `Assets::iconSvg()`:\n  - `preg_match(\u0027/^\\w+$/\u0027, $extension)`\n  - `src/helpers/Assets.php:927-931`\n\nHowever, that validation is only reached if `iconPath()` does **not** find a file.\nSo traversal payloads that resolve to existing `.svg` files bypass validation and are served by `sendFile()`.\n\n### Impact\n\n- Authenticated users can read local .svg files accessible to the application process.\n\n### References\n\n- https://github.com/craftcms/cms/commit/30f5f1a8d6edf0f3a00be72c42c78d9dc7d72d5c",
  "id": "GHSA-c43v-4cr8-6mvp",
  "modified": "2026-08-06T21:58:07Z",
  "published": "2026-07-09T13:44:06Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms/security/advisories/GHSA-c43v-4cr8-6mvp"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56394"
    },
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms/commit/30f5f1a8d6edf0f3a00be72c42c78d9dc7d72d5c"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/craftcms/cms"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/craft-cms-authenticated-path-traversal-in-assets-icon-extension-parameter"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Craft CMS has authenticated path traversal in `assets/icon`, allowing local `.svg` file read"
}



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