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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.

EPSS 0.01% · P1
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
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

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

CVE-2026-3244Concrete CMS below version 9.4.8 is vulnerable to Stored XSS in Search Results via Page Na
CVE-2026-3452Concrete CMS below 9.4.8 is vulnerable to stored deserialization leading to RCE in the Exp
CVE-2026-3242Concrete CMS below 9.4.8 is vulnerable to Stored XSS in the Switch Language block
CVE-2026-3240Concrete CMS below 9.4.8 is vulnerable to Stored XSS via Legacy form
CVE-2026-2994Concrete 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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