Stellar.org: Bypassing Verify Humans Page

Hi Team, I was able to bypass verify Human dialog Box , while subscribing . Vulnerable request: ==================== POST /subscribe/post HTTP/1.1 Host: stellar.us9.list-manage.com User-Agent: Mozilla/5.0 X11; Linux x8664; rv:54.0 Gecko/20100101 Firefox/54.0 Accept:...