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CVE-2026-56384— Craft CMS - Missing Authorization in assets/preview-thumb 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。 CraftCMS CMS 4.0.0-RC1版本至4.17.7版本和5.0.0-RC1版本至5.9.13版本存在授权问题漏洞，该漏洞源于assets/preview-thumb端点缺少授权检查，可能导致控制面板用户无需查看目标私有资产的权限，通过调用端点并使用攻击者控制的assetId获取包含私有资产预览链接的HTML。

CVSS 4.3 · Medium EPSS 0.33% · P24

Possible ATT&CK Techniques 1 AI

T1078.004 · Cloud Accounts

Affected Version Matrix 4

VendorProduct Version RangeStatus
craftcms cms 4.0.0-RC1< 4.17.8 affected
4.17.8 unaffected
5.0.0-RC1< 5.9.14 affected
5.9.14 unaffected
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I. Basic Information for CVE-2026-56384

Vulnerability Information
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Vulnerability Title
Craft CMS - Missing Authorization in assets/preview-thumb Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
Craft CMS contains a missing authorization vulnerability in the assets/preview-thumb endpoint. A Control Panel user without permission to view a target private asset can call the endpoint with an attacker-controlled assetId and receive preview HTML containing a signed fallback transform preview link for that private asset, because no asset-view permission check is performed before preview generation. This affects versions >= 4.0.0-RC1, <= 4.17.7 and >= 5.0.0-RC1, <= 5.9.13, and is fixed in 4.17.8 and 5.9.14.
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
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
CraftCMS 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。 CraftCMS CMS 4.0.0-RC1版本至4.17.7版本和5.0.0-RC1版本至5.9.13版本存在授权问题漏洞，该漏洞源于assets/preview-thumb端点缺少授权检查，可能导致控制面板用户无需查看目标私有资产的权限，通过调用端点并使用攻击者控制的assetId获取包含私有资产预览链接的HTML。
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 4.0.0-RC1 ~ 4.17.8 -

II. Public POCs for CVE-2026-56384

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III. Intelligence Information for CVE-2026-56384

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Patches & Fixes for CVE-2026-56384 (1)

Vendor Advisories for CVE-2026-56384 (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-2026-56385 4.3 MEDIUM Craft CMS - Authorization Bypass in assets/preview-file Endpoint

IV. Related Vulnerabilities

Same product: cms
Same vendor: craftcms
Same weakness: CWE-862

V. Comments for CVE-2026-56384

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