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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
# Exploit Title: YetiForce CRM < 3.1  - Persistant XSS Vulnerability
# Exploit Author: David Silveiro 
# Exploit Author Github: github.com/davidsilveiro
# Exploit Author Twitter: twitter.com/david_silveiro 
# Vendor Homepage: https://yetiforce.com/
# Software Link: http://sourceforge.net/projects/yetiforce/
# Date: Fixed on 20th June 2016

YetiForce CRM was built on a rock-solid Vtiger foundation, but has hundreds of changes that help to accomplish even the most challenging tasks in the simplest way

YetiForce is vulnerable to a stored XSS vulnerability present within a users comment section.

POC:

Within 'Companies & Accounts > Accounts' select your prefered user, and then in the 'Comments' section input;

<img src=x onerror=alert('XSS');>

Either refresh the current page, or navigate back to 'Accounts'