search.centrum.cz XSS vulnerability

Vulnerable URL:

http://search.centrum.cz/index.php?q=OPENBUGBOUNTY+%22OPENBUGBOUNTY%22+OPENBUGBOUNTY+OR+s+OR+OPENBUGBOUNTY+-OPENBUGBOUNTY&sec;=mix&l;=&filt;%5Blang%5D=&filt;%5Bformat%5D=htm%2Chtml&filt;%5Bsite%5D=OPENBUGBOUNTY