CVE-2026-47304: Microsoft Security Advisory CVE-2026-47304 – .NET Security Feature Bypass Vulnerability

July 20, 2026 (updated July 21, 2026)

Microsoft is releasing this security advisory to provide information about a vulnerability in .NET XML Encryption (System.Security.Cryptography.Xml). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

A security feature bypass vulnerability exists in the XML encryption implementation (EncryptedXml) in .NET 8, .NET 9, and .NET 10. An attacker could exploit this vulnerability to bypass encryption protections and access encrypted data.

References

github.com/advisories/GHSA-g8r8-53c2-pm3f
github.com/dotnet/announcements/issues/412
github.com/dotnet/runtime/issues/130709
github.com/dotnet/runtime/security/advisories/GHSA-g8r8-53c2-pm3f
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47304
nvd.nist.gov/vuln/detail/CVE-2026-47304

Code Behaviors & Features

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