CVE-2026-3240
Stored XSS in Concrete CMS Legacy Form Affects High-Privilege Users
Publication date: 2026-03-04
Last updated on: 2026-03-04
Assigner: ConcreteCMS
Description
Description
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 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 user who has permission to edit a page containing the Legacy form element to perform a stored Cross-Site Scripting (XSS) attack. The attack is executed via the 'Question' field and targets high-privilege accounts, potentially compromising their security.
How can this vulnerability impact me? :
The vulnerability can impact you by enabling an attacker with certain editing permissions to inject malicious scripts that are stored and later executed in the context of high-privilege users. This can lead to unauthorized actions performed by those high-privilege accounts, potentially compromising the integrity and security of your Concrete CMS installation.
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