CVE-2026-3240

MEDIUM

4.8

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.

CVE Details

CVSS v3.1 Score4.8

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredHIGH

User InteractionREQUIRED

Published3/4/2026

Last Modified3/4/2026

Sourcenvd

Honeypot Sightings0

Affected Products

concretecms:concrete_cms

Weaknesses (CWE)

CWE-79

References

https://documentation.concretecms.org/9-x/developers/introduction/version-history/948-release-notes(ff5b8ace-8b95-4078-9743-eac1ca5451de)

https://github.com/concretecms/concretecms/pull/12826(ff5b8ace-8b95-4078-9743-eac1ca5451de)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.