ChatPat v1.0 Homepage: http://calendarscripts.info/download-3.html Description: An online chat room that lets users chat with each other. Effected files: fastchat.php fastshow.php The nickname input form doesn't sanatize user input before it adds it to the db. In turn this can cause SQL query errors such as: UPDATE cp_users SET lastaction=NOW() WHERE nick='' You have an error in your SQL syntax. Check the manual that corresponds to your MySQL server version for the right syntax to use near 'XSS')">'' at line 3 XSS Vuln by submitting malicious text in the chatbox: