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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/52666/info
  
Open Journal Systems is prone to following multiple vulnerabilities because the software fails to sufficiently sanitize user-supplied input:
  
1. An arbitrary-file-deletion vulnerability
2. A security vulnerability
3. An arbitrary-file-upload vulnerability
4. Multiple cross-site scripting vulnerabilities
  
An attacker may leverage these issues to execute arbitrary script code, upload arbitrary files, and execute arbitrary code with administrative privileges. These issues may allow the attacker to steal cookie-based authentication credentials and launch other attacks.
  
Open Journal Systems 2.3.6 is vulnerable; other versions may also be affected. 

On the following URL:
http://www.example.com/index.php/[journal]/author/submit/3?articleId=[id]
the attacker should inject malicious scripting code to the "Bio Statement" or "Abstract of Submission" fields:
<img src="x"/onerror=alert(document.cookie)>
or (browser specific):
<img style="width:expression(alert(document.cookie));"></a>
The stored XSS will be displayed here:
http://www.example.com/index.php/[submission]/author/submission/[id]