Недостаточная фильтрация входящих данных.
$find= array(
'/about:/i','/vbscript:/i','/onclick/i','/onload/i','/onunload/i','/onabort/i',
'/onerror/i','/onblur/i','/onchange/i','/onfocus/i','/onreset/i','/onsubmit/i',
'/ondblclick/i','/onkeydown/i','/onkeypress/i','/onkeyup/i','/onmousedown/i',
'/onmouseup/i','/onmouseover/i','/onmouseout/i','/onselect/i','/javascript/i',
"'\[quote\]'si",
"'\[quote=(.+?)\]'si",
"'\[/quote\]'si",
);
$replace=array(
"about:","vbscript<b></b>:","onclick","onload","onunload",
"onabort","onerror","onblur","onchange","onfocus",
"onreset","onsubmit","ondblclick","onkeydown","onkeypress",
"onkeyup","onmousedown","onmouseup","onmouseover",
"onmouseout","onselect","javascript",
"<!--QuoteBegin--><div class=\"quote\"><!--QuoteEBegin-->",
"<!--QuoteBegin \\1 --><div class=\"title_quote\">{$lang['i_quote']} \\1</div><div class=\"quote\"><!--QuoteEBegin-->",
"<!--QuoteEnd--></div><!--QuoteEEnd-->",
);
Дистрибутив версии 7.3 обновлен.
