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Medium · 4.8 CVE-2026-3242 EUVD-2026-9360GHSA-w9qg-chfh-g3q9

Concrete CMS below 9.4.8 is vulnerable to Stored XSS in the Switch Language block

Published Mar 4, 2026 · Updated Mar 4, 2026 · Assigned by ConcreteCMS

Description

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.

Affected products

VendorProductAffectedFixed
Concrete CMS Concrete CMS — —

Affected packages

EcosystemPackageAffectedFixedRecord
Packagist concrete5/concrete5 < 9.4.8 9.4.8 GHSA-w9qg-chfh-g3q9

References