SMF 1.1.1 is vulnerabil too.

solution ->
In file PersonalMessage.php change 1417 and 1418 lines adding htmlspecialchars()
like this ->

$_REQUEST['to'] = empty($_POST['to']) ? (empty($_GET['to']) ? '' : $_GET['to']) : htmlspecialchars(stripslashes($_POST['to']));
$_REQUEST['bcc'] = empty($_POST['bcc']) ? (empty($_GET['bcc']) ? '' : $_GET['bcc']) : htmlspecialchars(stripslashes($_POST['bcc']));

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