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CVE-2026-8353— Concrete CMS version 9.0 to 9.5.0 is vulnerable to Stored XSS via page name in atomik theme

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开源的一个面向团队的开源内容管理系统。 Concrete CMS 9.0版本至9.5.0版本存在安全漏洞，该漏洞源于Atomik主题中的页面名称存在存储型跨站脚本，可能导致恶意编辑器注入任意JavaScript，在访问受影响账户页面的任何经过身份验证的用户环境中执行。

AI Predicted 5.4 Difficulty: Easy EPSS 0.25% · P15

Affected Version Matrix 1

VendorProduct Version RangeStatus
Concrete CMS Concrete CMS 9.0≤ 9.5.0 affected
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I. Basic Information for CVE-2026-8353

Vulnerability Information
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Vulnerability Title
Concrete CMS version 9.0 to 9.5.0 is vulnerable to Stored XSS via page name in atomik theme
Source: CVE Program / CVE List V5
Vulnerability Description
Concrete CMS version 9.0 to 9.5.0 is vulnerable to Stored XSS via page name in the Atomik theme. A rogue editor can inject arbitrary JavaScript that executes in the context of any authenticated user visiting the affected account pages. This can lead to session hijacking, credential theft, malicious actions performed on behalf of users, and potential privilege escalation. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 2.1 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/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:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Concrete CMS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Concrete CMS是Concrete CMS开源的一个面向团队的开源内容管理系统。 Concrete CMS 9.0版本至9.5.0版本存在安全漏洞，该漏洞源于Atomik主题中的页面名称存在存储型跨站脚本，可能导致恶意编辑器注入任意JavaScript，在访问受影响账户页面的任何经过身份验证的用户环境中执行。
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 9.0 ~ 9.5.0 -

II. Public POCs for CVE-2026-8353

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III. Intelligence Information for CVE-2026-8353

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Vendor Pages for CVE-2026-8353 (1)

Same Patch Batch · Concrete CMS · 2026-05-22 · 3 CVEs total

CVE-2026-8340 Concrete CMS 9.5.0 and below is vulnerable to CSRF via Backend\File::approveVersion
CVE-2026-8347 Concrete CMS 9.5.0 and below is vulnerable to IDOR + wrong-authorization-level in Express

IV. Related Vulnerabilities

Same product: Concrete CMS
Same vendor: Concrete CMS
Same weakness: CWE-79

V. Comments for CVE-2026-8353

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