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Vanilla Forums 2.1.1 Cross Site Scripting

🗓️ 13 Feb 2015 00:00:00Reported by W SType 
packetstorm
 packetstorm
🔗 packetstormsecurity.com👁 18 Views

The Vanilla Forums 2.1.1 has a cross site scripting vulnerability allowing bypassing of existing filter and injecting malicious code into HTML img tags, resulting in stored XSS. Vulnerable versions include 2.0 to 2.1.1

Code
`The vulnerability is related to the insufficient filtration in HTMLawed. Existing filter can be bypassed and paste into the HTML tag <img> onerror event, that leads to stored XSS.  
  
I notified the developers of existing vulnerabilities and they closed it in version 2.1.1  
  
proof:  
http://vanillaforums.org/discussion/27540/vanilla-2-1-1-important-security-bug-release  
  
vulnerable versions:  
2.0 to 2.1.1  
maybe 1.* versions  
  
my XSS exploit:  
<img alt="<img onerror=alert(1)//"<">  
  
  
`

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