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CVE-2026-56385— Craft CMS - Authorization Bypass in assets/preview-file Endpoint

Quick assessment

Affected
craftcms cms
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CraftCMS cms是CraftCMS的内容管理系统。 Craft CMS 存在授权问题漏洞，该漏洞源于assets/preview-file端点未强制执行每资产视图授权，可能导致已认证的低权限用户提供受托管的assetId来获取无权查看的资产的预览响应数据。

CVSS 4.3 · Medium EPSS 0.36% · P27

Possible ATT&CK Techniques 1 AI

T1528 · Steal Application Access Token

Affected Version Matrix 4

VendorProduct Version RangeStatus
craftcms cms 5.0.0-RC1< 5.9.14 affected
5.9.14 unaffected
4.0.0-RC1< 4.17.8 affected
4.17.8 unaffected
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I. Basic Information for CVE-2026-56385

Vulnerability Information
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Vulnerability Title
Craft CMS - Authorization Bypass in assets/preview-file Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Craft CMS 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CraftCMS cms是CraftCMS的内容管理系统。 Craft CMS 存在授权问题漏洞，该漏洞源于assets/preview-file端点未强制执行每资产视图授权，可能导致已认证的低权限用户提供受托管的assetId来获取无权查看的资产的预览响应数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
craftcms cms 5.0.0-RC1 ~ 5.9.14 -

II. Public POCs for CVE-2026-56385

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III. Intelligence Information for CVE-2026-56385

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Patches & Fixes for CVE-2026-56385 (1)

Vendor Advisories for CVE-2026-56385 (2)

Same Patch Batch · craftcms · 2026-06-21 · 7 CVEs total

CVE-2026-56382 7.2 HIGH Craft CMS - Remote Code Execution via Missing Config Sanitization in FieldsController
CVE-2026-56394 6.5 MEDIUM Craft CMS - Authenticated Path Traversal in assets/icon Extension Parameter
CVE-2026-56381 4.8 MEDIUM Craft CMS - Stored XSS via User Group Name in User Permissions Page
CVE-2026-56383 4.8 MEDIUM Craft CMS - Stored XSS in Table Field via Row Heading Column Type
CVE-2026-56393 4.8 MEDIUM Craft CMS - Multiple Stored Cross-Site Scripting in Settings Names and Field Options
CVE-2026-56384 4.3 MEDIUM Craft CMS - Missing Authorization in assets/preview-thumb Endpoint

IV. Related Vulnerabilities

Same product: cms
Same vendor: craftcms
Same weakness: CWE-639

V. Comments for CVE-2026-56385

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