Doz has reported a vulnerability in vBulletin, which can be exploited by malicious people to conduct cross-site scripting attacks.
Input passed to the form field "Extension" in admincp/attachment.php 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.
Successful exploitation requires that the target user is logged in as an administrator.
NOTE: The vendor disputes the issue, as it requires administrative privileges to exploit.
The vulnerability is reported in version 3.6.4 downloaded before 2007-02-12. Other versions may also be affected.
Solution: Update to version 3.6.4 available from 2007-02-12.
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