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CVE-2026-68535— Concrete CMS 9.2.0 to 9.5.2 is vulnerable to Missing authorization in the Concrete CMS Area REST API block-create path letting an editor reference files outside their file-manager permissions

Quick assessment

Affected
Concrete CMS Concrete 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.

Concrete CMS是Concrete CMS组织的一款灵活易用的企业级内容管理系统。 Concrete CMS 9.2.0版本至9.5.2版本存在授权问题漏洞，该漏洞源于Area API的block-create端点未对提交数据调用块类型控制器的validate()方法，导致持有block-add权限的已认证用户可存储并渲染文件管理器授权策略本应拒绝的文件引用，泄露该文件的URL和预览。

CVSS 5.1 · Medium EPSS 0.21% · P10

Affected Version Matrix 1

VendorProduct Version RangeStatus
Concrete CMS Concrete CMS 9.2.0≤ 9.5.2 affected
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I. Basic Information for CVE-2026-68535

Vulnerability Information
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Vulnerability Title
Concrete CMS 9.2.0 to 9.5.2 is vulnerable to Missing authorization in the Concrete CMS Area REST API block-create path letting an editor reference files outside their file-manager permissions
Source: CVE Program / CVE List V5
Vulnerability Description
Concrete CMS Area API's block-create endpoint in versions 9.2.0 to 9.5.2 did not invoke the block type controller's validate() method on submitted data, which, for file-referencing blocks such as hero_image and gallery, is where the referenced file is authorized against the user's file-manager visibility. As a result, an authenticated user holding the block-add scope could store, and cause the page to render, a reference to a file that the file-manager authorization policy would otherwise reject, disclosing that file's URL and preview to the editor and to visitors of the affected page. Under public file storage, the URL and thumbnail are exposed directly; under private storage, the disclosure is limited by the permission-checked download URL. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 5.1 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N. Thanks riodrwn for reporting.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Concrete CMS 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Concrete CMS是Concrete CMS组织的一款灵活易用的企业级内容管理系统。 Concrete CMS 9.2.0版本至9.5.2版本存在授权问题漏洞，该漏洞源于Area API的block-create端点未对提交数据调用块类型控制器的validate()方法，导致持有block-add权限的已认证用户可存储并渲染文件管理器授权策略本应拒绝的文件引用，泄露该文件的URL和预览。
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
Concrete CMS Concrete CMS 9.2.0 ~ 9.5.2 -

II. Public POCs for CVE-2026-68535

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III. Intelligence Information for CVE-2026-68535

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Vendor Pages for CVE-2026-68535 (1)

Same Patch Batch · Concrete CMS · 2026-09-11 · 15 CVEs total

CVE-2026-81907 6.1 MEDIUM Concrete CMS 9.5.2 and below is vulnerable to Cross-Site Request Forgery (CSRF) vin Expres
CVE-2026-81908 6.0 MEDIUM Missing Authorization in Concrete CMS 9.2.0 to 9.5.2 REST API Groups List Endpoint Allows
CVE-2026-18122 6.0 MEDIUM Concrete CMS 9.2.0 to 9.5.2 Express REST API list endpoint exposes restricted Express entr
CVE-2026-68528 6.0 MEDIUM Concrete CMS 9.5.2 and below is vulnerable to Stored XSS in RSS Displayer Block via Unesca
CVE-2026-81909 5.9 MEDIUM Concrete CMS 9 through 9.5.2 is vulnerable to Missing Authorization in the orphaned-block
CVE-2026-81910 5.9 MEDIUM Concrete CMS 9 through 9.5.2 is vulnerable to Server-Side Template Injection (SSTI) in The
CVE-2026-81911 5.8 MEDIUM Concrete CMS versions 9.0.0 to 9.5.2 is vulnerable to Stored XSS in Board Custom Slot save
CVE-2026-81912 5.7 MEDIUM Concrete CMS before 9.5.3 is vulnerable to Cross-Site Request Forgery in the Move Multiple
CVE-2026-81913 5.3 MEDIUM Concrete CMS versions 9.5.0 through 9.5.2 are vulnerable to Open Redirect via the rcURL pa
CVE-2026-68526 5.3 MEDIUM Concrete CMS before 9.5.3 is vulnerable to CSRF in the Calendar event duplicate dialog con
CVE-2026-81915 5.1 MEDIUM In Concrete CMS below 9.5.3, Page Type update omits object-level authorization
CVE-2026-81917 5.1 MEDIUM Concrete CMS below 9.5.3 is vulnerable to Stored XSS in the Document Library block file de
CVE-2026-81916 5.1 MEDIUM Incorrect Authorization in the Concrete CMS Express Entries Dashboard below version 9.5.3
CVE-2026-81918 4.8 MEDIUM Concrete CMS below 9.5.3 is vulnerable to Stored XSS via the Date Format field in the Page

IV. Related Vulnerabilities

Same product: Concrete CMS
Same vendor: Concrete CMS
Same weakness: CWE-862

V. Comments for CVE-2026-68535

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