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CVE-2026-81908— Missing Authorization in Concrete CMS 9.2.0 to 9.5.2 REST API Groups List Endpoint Allows Authenticated Users to Enumerate All Groups

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REST API Groups列表端点缺少授权，Groups.php中的listGroups()方法注册的权限检查回调无条件返回true，未对组集合执行逐对象授权，持有groups:read作用域API令牌的已认证用户可调用GET /ccm/api/1.0/groups获取站点上所有组，导致组织组结构、角色和访问层级信息泄露。

CVSS 6.0 · Medium EPSS 0.39% · P32

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-2026-81908

Vulnerability Information
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Vulnerability Title
Missing Authorization in Concrete CMS 9.2.0 to 9.5.2 REST API Groups List Endpoint Allows Authenticated Users to Enumerate All Groups
Source: CVE Program / CVE List V5
Vulnerability Description
Concrete CMS 9.2.0 to 9.5.2 contain a missing authorization vulnerability in the REST API Groups list endpoint. The listGroups() method in concrete/src/Api/Controller/Groups.php registers a permissions checker callback that unconditionally returns true, so no per-object (tree node) authorization is enforced when the group collection is returned. An authenticated user whose API token carries the groups:read scope can call GET /ccm/api/1.0/groups and receive every group on the site regardless of the view permissions on those groups, disclosing the organization's group structure, roles, and access hierarchy. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 6.0 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks Winston Crooker for reporting.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/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REST API Groups列表端点缺少授权，Groups.php中的listGroups()方法注册的权限检查回调无条件返回true，未对组集合执行逐对象授权，持有groups:read作用域API令牌的已认证用户可调用GET /ccm/api/1.0/groups获取站点上所有组，导致组织组结构、角色和访问层级信息泄露。
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-2026-81908

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III. Intelligence Information for CVE-2026-81908

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Vendor Pages for CVE-2026-81908 (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-2026-18122 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-2026-68535 5.1 MEDIUM Concrete CMS 9.2.0 to 9.5.2 is vulnerable to Missing authorization in the Concrete CMS Are
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-2026-81908

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