Language: Python
Label: vulnerable
CWE: CWE-20 \u2014 Improper Input Validation
The product receives input or data, but it does
        not validate or incorrectly validates that the input has the
        properties that are required to process the data safely and
        correctly.

Code:
    def set(self, name, value, force=False):
        """Set a form element identified by ``name`` to a specified ``value``.
        The type of element (input, textarea, select, ...) does not
        need to be given; it is inferred by the following methods:
        :func:`~Form.set_checkbox`,
        :func:`~Form.set_radio`,
        :func:`~Form.set_input`,
        :func:`~Form.set_textarea`,
        :func:`~Form.set_select`.
        If none of these methods find a matching element, then if ``force``
        is True, a new element (``<input type="text" ...>``) will be
        added using :func:`~Form.new_control`.

        Example: filling-in a login/password form with EULA checkbox

        .. code-block:: python

            form.set("login", username)
            form.set("password", password)
            form.set("eula-checkbox", True)

        Example: uploading a file through a ``<input type="file"
        name="tagname">`` field (provide the path to the local file,
        and its content will be uploaded):

        .. code-block:: python

            form.set("tagname", path_to_local_file)

        """
        for func in ("checkbox", "radio", "input", "textarea", "select"):
            try:
                getattr(self, "set_" + func)({name: value})
                return
            except InvalidFormMethod:
                pass
        if force:
            self.new_control('text', name, value=value)
            return
        raise LinkNotFoundError("No valid element named " + name)