This issue affects the design/header/welcome, design/header/logo src, design/header/logo src small, and design/header/logo alt system configs, which are intended to enable admins to set a text or define an image URL. Due to previously missing escaping, it allowed input of arbitrary HTML and, as a consequence, arbitrary JavaScript. This could be an issue in scenarios where users work with more restrictive roles in the backend, potentially leading to unintended privilege escalation.