Fix XSS issues on my website

My website has xss vulnerability. I need someone to fix it: URL:[login to view URL] Message&_wpcf7=5&_wpcf7_locale=en_US&_wpcf7_unit_tag=wpcf7-f5-o2&_wpcf7_version=4.3.1&_wpnonce=1d0e5288b7&s=1&submit=1&your-email=1&your-message=1&your-name=1 Description:,_wpcf7,_wpcf7_locale,_wpcf7_unit_tag,_wpcf7_version,_wpnonce,s,submit,your-email,your-message,your-name URL:[login to view URL] Description:_wpcf7,_wpcf7_locale,_wpcf7_unit_tag,_wpcf7_version,_wpnonce,s,submit,your-email,your-message,your-name URL:[login to view URL] Description:s,submit URL:[login to view URL] Description:s,submit