Automattic: Reflected XSS due to vulnerable version of sockjs

Summary: There is reflected XSS on .simperium.com. The bug exists due to a vulnerable version of sockjs library. Platforms Affected: simperium.com js.simperium.com Steps To Reproduce: 1. Visit https://simperium.com/sock/1/0/0/0/htmlfile?c=alert'XSS'// 2. You will see an alert message because of...