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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/53448/info
 
Chevereto Image Upload Script is prone to a cross-site scripting vulnerability and an information-disclosure vulnerability because it fails to properly sanitize user-supplied input before using it in dynamically generated content.
 
An attacker may leverage the cross-site scripting issue to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This can allow the attacker to steal cookie-based authentication credentials and to launch other attacks.
 
An attacker may leverage the information-disclosure issue to enumerate the existence of local files. Information obtained may aid in further attacks.
 
Chevereto Image Upload Script 1.91 is vulnerable; other versions may also be affected. 

http://www.example.com/learn/chevereto/chevereto_nb1.91/Upload/?v=../index.php