CVE-2026-8245: Concrete CMS 9.5.0 and below is vulnerable to Reflected XSS in Legacy Pagination via HTML attribute injection
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 Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-8245?
CVE-2026-8245 has a medium severity rating with a CVSS score of 4.0.
How do I fix CVE-2026-8245?
To fix CVE-2026-8245, upgrade your Concrete CMS to version 9.5.1 or higher.
What type of vulnerability is CVE-2026-8245?
CVE-2026-8245 is a Reflected Cross-Site Scripting (XSS) vulnerability.
Who is affected by CVE-2026-8245?
CVE-2026-8245 affects users of Concrete CMS versions 9.5.0 and below, specifically authenticated admins and report viewers.
When was CVE-2026-8245 published?
CVE-2026-8245 was published on May 21, 2026.