CVE-2026-3241

MEDIUM

4.8

Description

In Concrete CMS below version 9.4.8, a stored cross-site scripting (XSS) vulnerability exists in the "Legacy Form" block. An authenticated user with permissions to create or edit forms (e.g., a rogue administrator) can inject a persistent JavaScript payload into the options of a multiple-choice question (Checkbox List, Radio Buttons, or Select Box). This payload is then executed in the browser of any user who views the page containing the form. 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.

Details CVE

Score CVSS v3.14.8

SeveriteMEDIUM

Vecteur CVSSCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Vecteur d'attaqueNETWORK

ComplexiteLOW

Privileges requisHIGH

Interaction utilisateurREQUIRED

Publie3/4/2026

Derniere modification3/4/2026

Sourcenvd

Observations honeypot0

Produits affectes

concretecms:concrete_cms

Faiblesses (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)

Correlations IOC

Aucune correlation enregistree

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