** DISPUTED ** Reflected Cross-Site Scripting vulnerability in \Design\ on \Edit device layout\ in Kentico 9 through 11 allows remote attackers to execute malicious JavaScript via a malicious devicename parameter in a link that is entered via the \Pages -> Edit template properties -> Device Layouts -> Create device layout (and edit created device layout) -> Design\ screens. NOTE: the vendor has responded that there is intended functionality for authorized users to edit and update ascx code layout.