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CVE-2026-3241— Concrete CMS below version 9.4.8 is vulnerable to a stored cross-site scripting (XSS) in the "Legacy Form" 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Legacy Form块存在存储型跨站脚本，可能导致恶意JavaScript载荷在用户浏览器中执行。

AI Predicted 6.1 Difficulty: Easy EPSS 0.28% · P18
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I. Basic Information for CVE-2026-3241

Vulnerability Information
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Vulnerability Title
Concrete CMS below version 9.4.8 is vulnerable to a stored cross-site scripting (XSS) in the "Legacy Form" block.
Source: CVE Program / CVE List V5
Vulnerability Description
In Concrete CMS below version 9.4.8, a stored cross-site scripting (XSS) vulnerability exists in the "Legacy Form" block. An authenticated user with permissions to create or edit forms (e.g., a rogue administrator) can inject a persistent JavaScript payload into the options of a multiple-choice question (Checkbox List, Radio Buttons, or Select Box). This payload is then executed in the browser of any user who views the page containing the form. 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Legacy Form块存在存储型跨站脚本，可能导致恶意JavaScript载荷在用户浏览器中执行。
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 5 ~ 9.4.8 -

II. Public POCs for CVE-2026-3241

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III. Intelligence Information for CVE-2026-3241

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Patches & Fixes for CVE-2026-3241 (1)

Vendor Pages for CVE-2026-3241 (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-2026-3242 Concrete CMS below 9.4.8 is vulnerable to Stored XSS in the Switch Language block
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-2026-3241

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