CVE-2026-3242

In Concrete CMS below version 9.4.8, a rogue administrator can add stored XSS via the Switch Language block.  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.

Score

CVSS 4.0 4.8 Medium

Status

Analyzed - ff5b8ace-8b95-4078-9743-eac1ca5451de

Published

2026-03-04

Last modified

2026-03-04

Weaknesses

CWE-79

Affected products

• Concrete Cms (Concrete Cms)
• Concrete Cms (Concretecms)

References

• https://documentation.concretecms.org/9-x/developers/introduction/version-history/948-release-notes
• https://github.com/concretecms/concretecms/pull/12826