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CVE-2026-3242— Concrete CMS below 9.4.8 is vulnerable to Stored XSS in the Switch Language block

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 9.4.8之前版本存在安全漏洞，该漏洞源于Switch Language块存在存储型跨站脚本，可能导致恶意管理员添加恶意脚本。

AI Predicted 5.4 Difficulty: Easy EPSS 0.28% · P18

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript
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I. Basic Information for CVE-2026-3242

Vulnerability Information
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Vulnerability Title
Concrete CMS below 9.4.8 is vulnerable to Stored XSS in the Switch Language block
Source: CVE Program / CVE List V5
Vulnerability Description
In Concrete CMS below version 9.4.8, a rogue administrator can add stored XSS via the Switch Language block.  The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 4.8 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N.  Thanks M3dium for reporting.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/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 9.4.8之前版本存在安全漏洞，该漏洞源于Switch Language块存在存储型跨站脚本，可能导致恶意管理员添加恶意脚本。
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 ~ 9.4.8 -

II. Public POCs for CVE-2026-3242

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III. Intelligence Information for CVE-2026-3242

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Patches & Fixes for CVE-2026-3242 (1)

Vendor Pages for CVE-2026-3242 (1)

Same Patch Batch · Concrete CMS · 2026-03-04 · 6 CVEs total

CVE-2026-3244 Concrete CMS below version 9.4.8 is vulnerable to Stored XSS in Search Results via Page Na
CVE-2026-3452 Concrete CMS below 9.4.8 is vulnerable to stored deserialization leading to RCE in the Exp
CVE-2026-3241 Concrete CMS below version 9.4.8 is vulnerable to a stored cross-site scripting (XSS) in t
CVE-2026-3240 Concrete CMS below 9.4.8 is vulnerable to Stored XSS via Legacy form
CVE-2026-2994 Concrete CMS below 9.4.8 is vulnerable to CSRF by a Rogue Admin using the Anti-Spam Allowl

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-3242

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