CVE-2026-3242
Received Received - Intake
Stored XSS in Concrete CMS Switch Language Block (Pre

Publication date: 2026-03-04

Last updated on: 2026-03-04

Assigner: ConcreteCMS

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.
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Meta Information
Published
2026-03-04
Last Modified
2026-03-04
Generated
2026-06-16
AI Q&A
2026-03-04
EPSS Evaluated
2026-06-15
NVD
CVE-2026-3242
EUVD
EUVD-2026-9360
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
concretecms concrete_cms to 9.4.8 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
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Impact Analysis

The vulnerability can lead to stored XSS attacks, which may allow an attacker with administrator privileges to inject malicious scripts that execute in the browsers of users who view the affected content. This can result in unauthorized actions performed on behalf of users, data theft, or session hijacking.

Compliance Impact

I don't know

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Executive Summary

This vulnerability exists in Concrete CMS versions below 9.4.8. It allows a rogue administrator to add stored Cross-Site Scripting (XSS) attacks via the Switch Language block.

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