CVE-2026-3242— Concrete CMS below 9.4.8 is vulnerable to Stored XSS in the Switch Language block
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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: NVD (National Vulnerability Database)
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: 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
| # | POC Description | Source Link | Shenlong Link |
|---|
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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
- CVE-2026-2994
Concrete CMS below 9.4.8 is vulnerable to CSRF by a Rogue Ad - CVE-2026-3240
Concrete CMS below 9.4.8 is vulnerable to Stored XSS via Leg - CVE-2026-3241
Concrete CMS below version 9.4.8 is vulnerable to a stored c - CVE-2026-3244
Concrete CMS below version 9.4.8 is vulnerable to Stored XSS - CVE-2026-3452
Concrete CMS below 9.4.8 is vulnerable to stored deserializa
Same vendor: Concrete CMS
- CVE-2026-2994
Concrete CMS below 9.4.8 is vulnerable to CSRF by a Rogue Ad - CVE-2026-3240
Concrete CMS below 9.4.8 is vulnerable to Stored XSS via Leg - CVE-2026-3241
Concrete CMS below version 9.4.8 is vulnerable to a stored c - CVE-2026-3244
Concrete CMS below version 9.4.8 is vulnerable to Stored XSS - CVE-2026-3452
Concrete CMS below 9.4.8 is vulnerable to stored deserializa
Same weakness: CWE-79
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V. Comments for CVE-2026-3242
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