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CVE-2026-81904— Concrete CMS before 9.5.3 is vulnerable to Missing Authorization in Stack/Container Sub-Block Asset Registration

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.

以下是该漏洞描述的中文翻译： 在 Concrete CMS 9.5.3 之前的版本中，系统会为 Stack（堆栈）、Container（容器）或布局区域中的每个子块注册视图资源，但未检查请求用户是否有权查看该子块。未认证的访客可以从任何嵌入了受影响 Stack、Container 或布局区域的公开页面中，恢复由受限制子块的资源注册所输出的配置值——例如站点配置的 Google Maps API 密钥——即使该子块在块级别有权限限制。任何其资源或页脚钩子会输出配置值的子块类型均受此影响。Concrete CMS 安全

CVSS 6.3 · Medium

Possible ATT&CK Techniques 1 AI

T1598 · Phishing for Information
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I. Basic Information for CVE-2026-81904

Vulnerability Information
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Vulnerability Title
Concrete CMS before 9.5.3 is vulnerable to Missing Authorization in Stack/Container Sub-Block Asset Registration
Source: CVE Program / CVE List V5
Vulnerability Description
Concrete CMS below 9.5.3 registered view assets for every sub-block of a Stack, Container, or layout area without checking whether the requesting user could view that sub-block. An unauthenticated visitor could recover configuration values emitted by a restricted sub-block's asset registration — such as a site's configured Google Maps API key — from any public page embedding an affected Stack, Container, or layout area, despite the block-level permission restriction. Any sub-block type whose asset or header hooks output configuration values is affected.  The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 6.3 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks Yonatan Drori (Tenzai) for reporting.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Concrete CMS Concrete CMS 5 ~ 9.5.2 -

II. Public POCs for CVE-2026-81904

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III. Intelligence Information for CVE-2026-81904

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Vendor Pages for CVE-2026-81904 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-81904

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