A significant vulnerability has been identified in the Windows Remote Desktop Protocol (RDP), which allows old credentials to remain functional even after a password reset. Security researcher Daniel Wade revealed that users can still access their systems with previously revoked credentials due to the authentication process relying on locally stored credentials that do not update in real-time. Microsoft's Security Response Center acknowledged this behavior but stated it is an intentional design to ensure at least one user account can log in, regardless of the system's online status. Microsoft has been aware of this issue since at least August 2023 and has chosen not to modify the code, citing potential compatibility issues.