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
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.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| concretecms | concrete_cms | to 9.4.8 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| 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. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
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.
How can this vulnerability impact me? :
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.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know
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