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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.

Concrete CMS Concrete CMS是Concrete CMS组织的内容管理系统。 Concrete CMS 9.5.3之前版本存在授权问题漏洞，该漏洞源于为 Stack、Container 或布局区域的每个子块注册视图资产时未检查请求用户是否可查看该子块，可能导致未经身份验证的访问者从公共页面恢复受限子块资产注册输出的配置值，例如 Google Maps API 密钥。

CVSS 6.3 · Medium EPSS 0.46% · P39

Possible ATT&CK Techniques 1 AI

T1598 · Phishing for Information

Affected Version Matrix 1

VendorProduct Version RangeStatus
Concrete CMS Concrete CMS 5≤ 9.5.2 affected
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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
Vulnerability Title
Concrete CMS 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Concrete CMS Concrete CMS是Concrete CMS组织的内容管理系统。 Concrete CMS 9.5.3之前版本存在授权问题漏洞，该漏洞源于为 Stack、Container 或布局区域的每个子块注册视图资产时未检查请求用户是否可查看该子块，可能导致未经身份验证的访问者从公共页面恢复受限子块资产注册输出的配置值，例如 Google Maps API 密钥。
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 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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