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CVE-2026-81916— Incorrect Authorization in the Concrete CMS Express Entries Dashboard below version 9.5.3 Allows Entry Creation in an Unauthorized Object

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 在 9.5.3 版本之前，在评估 Express 条目提交的授权检查时，是相对于所提交表单的实体，而非仪表盘路由所识别的实体进行判断的。因此，一个被允许向某个 Express 对象添加条目的用户，可以在其授权范围之外的另一个 Express 对象中创建条目，从而可能污染受保护的数据集、触发工作流，或将内容注入到管理流程中。具体机制是：仪表盘提交路由从攻击者可控的路由 ID 解析出被变更的实体，而权限检查则验证了独立提交的表单的实体，由于这两个实体从未被相互比较，提交得以成功执行。Concr

CVSS 5.1 · Medium
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I. Basic Information for CVE-2026-81916

Vulnerability Information
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Vulnerability Title
Incorrect Authorization in the Concrete CMS Express Entries Dashboard below version 9.5.3 Allows Entry Creation in an Unauthorized Object
Source: CVE Program / CVE List V5
Vulnerability Description
Concrete CMS before 9.5.3 evaluated the authorization check for an Express entry submission against the entity of the posted form rather than the entity identified by the dashboard route. As a result, a user permitted to add entries to one Express object could create entries in a different Express object outside their authorization scope, potentially polluting protected datasets, triggering workflows, or injecting content into administrative processes. The dashboard submit route resolved the mutated entity from the attacker-controlled route ID while the permission check validated the independently posted form's entity, and the submission proceeded because the two entities were never compared. 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:N/SC:N/SI:N/SA:N. Thanks Yonatan Drori from Tenzai 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: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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Concrete CMS Concrete CMS 5.0.0 ~ 9.5.2 -

II. Public POCs for CVE-2026-81916

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III. Intelligence Information for CVE-2026-81916

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Vendor Pages for CVE-2026-81916 (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-2026-68535 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-2026-81916

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