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GHSA-44px-qjjc-xrhqlow1.3

Craft CMS: Authorized asset "preview file" requests bypass allows users without asset access to retrieve private preview metadata

Impact

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.

Source excerpt · OSV

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

craftcms/cms Packagist
Affected rangeRecorded fix
From 5.0.0-RC1 before 5.9.14Ecosystem versions5.9.14
From 4.0.0-RC1 before 4.17.8Ecosystem versions4.17.8

Version evidence: OSV · GHSA-44px-qjjc-xrhq

View original version evidence (400 explicit versions)

Original source description

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

References