CVE-2026-8428 — Concretecms Concrete_cms: Concrete CMS 9.5.0 and below emits a CSRF token in the local_available_update.php view ($token->output('do_update'))
Concrete CMS 9.5.0 and below emits a CSRF token in the local_available_update.php view ($token->output('do_update')) but the corresponding do_update() method in concrete/controllers/single_page/dashboard/system/update/update.php never calls $this->token->validate('do_update'). The form is rendered as a POST form, meaning the token reaches the browser, but because the controller discards it without verification, an attacker can craft a cross-site POST that triggers a core CMS CVSSv3.1 8.8 (HIGH)