From PC World: According to Microsoft, the issue with security warnings when opening RDP files are due to a bug that’s supposedly been fixed in update KB5083631. That’s an optional Windows 11 update that rolled out on April 30th. If you want to resolve this bug before the next update hits in May, the easiest way is to install KB5083631 via Windows Update.
Following the latest security updates for Windows 11, users are reporting issues with the Remote Desktop feature. Microsoft has now officially confirmed the bug and has outlined some initial workarounds.
Updates KB5083769 and KB5082052, which were released in April 2026, are affected. While these updates were intended to address various security vulnerabilities and introduce improvements, they’re also causing display errors for some users.
With KB5083769, Microsoft introduced additional protection mechanisms for Remote Desktop connections. This was prompted by the CVE-2026-26151 vulnerability, which could allow manipulated RDP files to be exploited.
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