Open Redirect via Non-Latin Subdomain in vcc-*.8x8.com/AGUI/█.php

@pentestor reported an issue where a filter that prevents the usage of [1-9] and [a-z] characters in the `subdomain` parameter can be bypassed by utilizing a non-Latin domain. The report demonstrates the exploitation of this vulnerability by redirecting to the `नमस्ते.भारत` domain. The issue has been addressed.