CVE-2026-50646: Microsoft Security Advisory CVE-2026-50646 – .NET Remote Code Execution Vulnerability

September 8, 2026

Microsoft is releasing this security advisory to provide information about a vulnerability in Windows Presentation Foundation (WPF). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

A remote code execution vulnerability exists in Windows Presentation Foundation (WPF) in .NET 8, .NET 9, and .NET 10 when parsing specially crafted XAML input. An attacker who successfully exploits this vulnerability could execute arbitrary code in the context of the current user.

References

github.com/advisories/GHSA-gh2h-rhph-h37g
github.com/dotnet/announcements/issues/418
github.com/dotnet/wpf/issues/11782
github.com/dotnet/wpf/security/advisories/GHSA-gh2h-rhph-h37g
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50646
nvd.nist.gov/vuln/detail/CVE-2026-50646

Code Behaviors & Features

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