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Craft CMS has authenticated path traversal in `assets/icon`, allowing local `.svg` file read — craftcms / cms

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

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
  • Published: Jul 9, 2026
  • Updated: Jul 10, 2026
  • GHSA: GHSA-c43v-4cr8-6mvp
  • Severity: Low
  • Exploit:
  • CISA KEV:

No technical information available.

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