CVE-2026-8245: Concretecms Concrete CMS

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

Concrete CMS 9.5.0 and below is vulnerable to Reflected XSS in Legacy Pagination via HTML attribute injection. Concrete\Core\Legacy\Pagination builds pagination links by raw-interpolating its $URL field into href="" (<a href="{$linkURL}" …>). Any authenticated admin or report viewer with access to `/dashboard/reports/forms/legacy` who clicks the crafted URL fires the payload in their session. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 6.0 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Yonatan Drori (Tenzai) for reporting

Affected products

• Concretecms Concrete CMS: before 9.5.1 (fixed in 9.5.1)

Published 2026-05-21. Last modified 2026-07-23.