pyLoad allows upload to arbitrary folder lead to RCE

@bp.route("/render/<path:filename>", endpoint="render")
def render(filename):
    mimetype = mimetypes.guess_type(filename)[0] or "text/html"
    data = render_template(filename)
    return flask.Response(data, mimetype=mimetype)

@bp.route("/json/add_package", methods=["POST"], endpoint="add_package")
# @apiver_check
@login_required("ADD")
def add_package():
    api = flask.current_app.config["PYLOAD_API"]

    package_name = flask.request.form.get("add_name", "New Package").strip()
    queue = int(flask.request.form["add_dest"])
    links = [l.strip() for l in flask.request.form["add_links"].splitlines()]
    pw = flask.request.form.get("add_password", "").strip("\n\r")

    try:
        file = flask.request.files["add_file"]

        if file.filename:
            if not package_name or package_name == "New Package":
                package_name = file.filename

            file_path = os.path.join(
                api.get_config_value("general", "storage_folder"), "tmp_" + file.filename
            )
            file.save(file_path)
            links.insert(0, file_path)

    except Exception:
        pass

    urls = [url for url in links if url.strip()]
    pack = api.add_package(package_name, urls, queue)
    if pw:
        data = {"password": pw}
        api.set_package_data(pack, data)

    return jsonify(True)

@route("/media/js/<path:re:.+\.js>")
def js_dynamic(path):
    response.headers['Expires'] = time.strftime("%a, %d %b %Y %H:%M:%S GMT",
                                                time.gmtime(time.time() + 60 * 60 * 24 * 2))
    response.headers['Cache-control'] = "public"
    response.headers['Content-Type'] = "text/javascript; charset=UTF-8"

    try:
        # static files are not rendered
        if "static" not in path and "mootools" not in path:
            t = env.get_template("js/%s" % path)
            return t.render()
        else:
            return static_file(path, root=join(PROJECT_DIR, "media", "js"))
    except:
        return HTTPError(404, "Not Found")