可直接替换/system/function.app.php中remove_xss方法：

/*移除XSS*/
function remove_xss($html) {
preg_match_all("/\<([^\<]+)\>/is", $html, $ms);
if ($ms[1]) {
$allowtags = 'img|a|font|div|table|tbody|caption|tr|td|th|br|p|b|strong|i|u|em|span|ol|ul|li|blockquote|video|code|pre';
$ms[1] = array_unique($ms[1]);
foreach ($ms[1] as $value) {
$value = str_replace('&', '_uch_tmp_str_', $value);
$value = string_htmlspecialchars($value);
$value = str_replace('_uch_tmp_str_', '&', $value);
$value = str_replace(array('\\', '/*'), array('.', '/.'), $value);
$skipkeys = array('onabort','onactivate','onafterprint','onafterupdate','onbeforeactivate','onbeforecopy','onbeforecut','onbeforedeactivate',
'onbeforeeditfocus','onbeforepaste','onbeforeprint','onbeforeunload','onbeforeupdate','onblur','onbounce','oncellchange',
'oncontextmenu','oncontrolselect','oncopy','oncut','ondataavailable','ondatasetchanged','ondatasetcomplete','ondblclick',
'ondeactivate','ondrag','ondragend','ondragenter','ondragleave','ondragover','ondragstart','ondrop','onerror','onerrorupdate',
'onfilterchange','onfinish','onfocus','onfocusin','onfocusout','onhelp','onkeydown','onkeypress','onkeyup','onlayoutcomplete',
'onload','onlosecapture','onmousedown','onmouseenter','onmouseleave','onmousemove','onmouseout','onmouseover','onmouseup','onmousewheel',
'onmove','onmoveend','onmovestart','onpaste','onpropertychange','onreadystatechange','onreset','onresize','onresizeend','onresizestart',
'onrowenter','onrowexit','onrowsdelete','onrowsinserted','onscroll','onselect','onselectionchange','onselectstart','onstart','onstop',
'onsubmit','onunload','javascript','script','eval','behaviour','expression');
$skipstr = implode('|', $skipkeys);
$value = preg_replace(array("/($skipstr)/i"), '.', $value);
if (!preg_match("/^[\/|\s]?($allowtags)(\s+|$)/is", $value)) {
$value = '';
}
$replaces[] = empty($value) ? '' : "<" . str_replace('"', '"', $value) . ">";
}
}
return $html;
}

或者直接下载覆盖该文件：

functions.app.zip