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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.

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source: https://www.securityfocus.com/bid/47131/info

MyBB is prone to multiple security vulnerabilities. These vulnerabilities include a username-enumeration weakness, an XML-injection vulnerability, and a cross-site scripting vulnerability.

Exploiting these issues may allow attackers to discern valid usernames, which may aid them in brute-force password cracking or other attacks. Attacker-supplied XML and script code would run in the context of the affected browser, potentially allowing the attacker to steal cookie-based authentication credentials or to control how the site is rendered to the user.

Versions prior to 1.6.2 and 1.4.15 are vulnerable. 

XML-injection:
http://www.example.com/xmlhttp.php?action=username_exists&value=%3Cxml/%3E

XSS:
http://www.example.com/xmlhttp.php?action=username_exists&value=%3Cdiv%20xmlns=%22http://www.w3.org/1999/xhtml%22%3E%3Cscript%3Ealert(document.cookie)%3C/script%3E%3C/div%3E