Description

In Concrete CMS below version 9.4.8, a user with permission to edit a page with element Legacy form can perform a stored XSS attack towards high-privilege accounts via the Question field. 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 minhnn42, namdi and quanlna2 from VCSLab-Viettel Cyber Security for reporting.

INFO

Published Date :

2026-03-04T02:15:53.400Z

Last Modified :

2026-03-04T02:15:53.400Z

Source :

ConcreteCMS
AFFECTED PRODUCTS

The following products are affected by CVE-2026-3240 vulnerability.

No data.

REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-3240.

URL Resource
https://documentation.concretecms.org/9-x/developers/introduction/version-history/948-release-notes cve-icon cve-icon
https://github.com/concretecms/concretecms/pull/12826 cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Attack Requirements
Privileges Required
User Interaction
VS Confidentiality
VS Integrity
VS Availability
SS Confidentiality
SS Integrity
SS Availability