Microsoft has shipped one of the most practically useful security updates in recent memory, and if you work in an environment where Remote Desktop files get passed around regularly, this one is worth paying attention to. The April 2026 cumulative updates for both Windows 10 and Windows 11 bring a set of new protections designed to stop attackers from using RDP files as a backdoor into your system.
The problem with RDP files
Remote Desktop Protocol files are a staple in enterprise environments. They let admins preconfigure connections to remote systems, which sounds harmless enough until you realize that the same functionality can be weaponized fairly easily. Open the wrong RDP file and your device can silently connect to an attacker-controlled server, handing over access to your local drives, clipboard contents, and authentication credentials without you ever knowing it happened.
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