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.
{
"github_reviewed_at": "2026-06-24T21:11:32Z",
"severity": "MODERATE",
"cwe_ids": [
"CWE-83"
],
"github_reviewed": true,
"nvd_published_at": "2026-05-21T22:16:50Z"
}