CVE-2026-41655: Admidio has Path Traversal in ECard Preview that Allows Reading Arbitrary Server Files Including Database Credentials

The ecard_preview.php endpoint does not validate that the ecard_template POST parameter is a safe filename before passing it to ECard::getEcardTemplate(). An authenticated user can supply a path traversal payload (e.g., ../config.php) to read arbitrary files accessible to the web server process, including adm_my_files/config.php which contains database credentials.