Language: Python
Label: vulnerable
CWE: CWE-79 \u2014 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Code:
    def validate_absolute_path(self, root, absolute_path):
        try:
            media_file_manager.get(absolute_path)
        except KeyError:
            LOGGER.error("MediaFileManager: Missing file %s" % absolute_path)
            raise tornado.web.HTTPError(404, "%s not found", absolute_path)

        return absolute_path