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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 区域 API（Area API）的 block-create 端点在 9.2.0 至 9.5.2 版本中，未对提交的数据调用区块类型控制器的 方法。对于涉及文件引用的区块（如 和 ），该 方法正是用于将所引用的文件与用户的文件管理器可见性策略进行授权校验的地方。 由于这一缺失，拥有 block-add 权限范围的已认证用户可以保存并导致页面渲染出指向某个文件的引用，而该文件本应被文件管理器授权策略拒绝。这会导致该文件的 URL 及其预览图向编辑者以及访问受影响页面的访客披露。 在公共文件存

CVSS 5.1 · Medium
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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

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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