SeedDMS 5.1.11 - out.UsrMgr.php Cross-Site Scripting

# Exploit Title: [Persistent Cross-Site Scripting or Stored XSS in out/out.UsrMgr.php in SeedDMS before 5.1.11]
# Google Dork: [NA]
# Date: [20-June-2019]
# Exploit Author: [Nimit Jain](https://www.linkedin.com/in/nimitiitk)(https://secfolks.blogspot.com)
# Vendor Homepage: [https://www.seeddms.org]
# Software Link: [https://sourceforge.net/projects/seeddms/files/]
# Version: [< 5.1.11] (REQUIRED)
# Tested on: [NA]
# CVE : [CVE-2019-12745]

Proof-of-Concept:

Step 1: Login to the application and go to My account and edit user details.
Step 2: Change the name by adding <script>alert("name")</script> 
Step 3: Now browse to user management option in Admin-tools and click on choose user to execute the previously inserted javascript.