hestiacp/web/bulk/backup/exclusions/index.php

<?php
use function Hestiacp\quoteshellarg\quoteshellarg;

ob_start();

include($_SERVER['DOCUMENT_ROOT']."/inc/main.php");

$backup = $_POST['system'];
$action = $_POST['action'];

// Check token
verify_csrf($_POST);

switch ($action) {
    case 'delete': $cmd='v-delete-user-backup-exclusions';
        break;
    default: header("Location: /list/backup/exclusions"); exit;
}

foreach ($backup as $value) {
    $value = quoteshellarg($value);
    exec(HESTIA_CMD.$cmd." ".$user." ".$value, $output, $return_var);
}

header("Location: /list/backup/exclusions");