要点
- CVE-2026-56385 は craftcms/cms に影響する深刻度「中」 (CVSS 4.3) の脆弱性です。
- 今後30日間に悪用される確率（EPSS）：0.36%（全脆弱性の 29.7% より高い）。
- 対処：4.17.8, 5.9.14 以降に更新してください。
| パッケージ | 影響を受けるバージョン | 修正済みバージョン |
|---|
| craftcms/cms Packagist | ≥ 4.0.0-RC1, < 4.17.8≥ 5.0.0-RC1, < 5.9.14
| 4.17.85.9.14
|
概要
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
assets/preview-file accepts a maliciously controlled assetId and renders preview output.- The action does not enforce per-asset view authorization prior to returning preview content.
- 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
NVD の説明
Craft CMS versions >= 5.0.0-RC1, <= 5.9.13 and >= 4.0.0-RC1, <= 4.17.7 contain an authorization bypass in the assets/preview-file endpoint. The action does not enforce per-asset view authorization before returning preview content, allowing an authenticated low-privileged user to supply a controlled assetId for an asset they are not permitted to view and still receive preview response data (previewHtml), including a private preview image route containing the target private assetId. Fixed in 5.9.14 and 4.17.8.
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