Malcolm is a network traffic analysis tool suite. The file-upload component (FilePond PHP backend) accepts uploads at "POST /server/php/submit.php" and stores them in a directory served by the same nginx and php-fpm instance. The allow-list that should restrict accepted file types is an empty array by default ("file-upload/php/config.php:16"), so the type check is a no-op and every extension is accepted. The filename sanitizer keeps the ".php" extension intact. Committed files land in "/var/www/upload/server/php/files" ("file-upload/php/config.php:7"), and the component's nginx routes any URL ending in ".php" to php-fpm. An authenticated "GET /server/php/files/<name>.php" then executes the uploaded code as "www-data". Prior to version 26.06.1, in RBAC mode, the upload endpoint is reachable by the granular "ROLE_UPLOAD" role ("nginx/lua/nginx_auth_helpers.lua:71"), a role intended only for submitting capture files. As a result, a user holding the upload-only role runs arbitrary PHP as "www-data" inside the file-upload container. Version 26.06.1 fixes the issue.