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VULNERABILITIES

CVE-2026-3240 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:4.8 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://documentation.concretecms.org/9-x/developers/introduction/version-history/948-release-notes ConcreteCMSPatchRelease NotesVendor Advisory
https://github.com/concretecms/concretecms/pull/12826 ConcreteCMSExploitIssue TrackingVendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')ConcreteCMS

Affected Products

ProductVersions
concretecms concrete cms
< 9.4.8

CPE

  • cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-3240
NVD Published Date:
Mar 4, 2026
NVD Last Modified:
Jun 17, 2026
Source:
ConcreteCMS
CVE-2026-3240 Details - Not Deferred