A vulnerability has been reported in UBB.threads, which can be exploited by malicious people to conduct cross-site scripting attacks.
Input passed to the "Loginname" POST parameter in forums/ubbthreads.php (when "ubb" is set to "start_page" and "buttforgot" is set) is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.
The vulnerability is reported in version 7.5.6. Other versions may also be affected.
Solution: Filter malicious characters and character sequences using a proxy.
Provided and/or discovered by: Sony
Original Advisory: http://st2tea.blogspot.com/2012/01/ubb-forum756-cross-site-scripting.html
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