CVE-2026-47304: Microsoft .NET improper cryptographic signature verification

CVE-2026-47304 · Severity: high · CVSS 8.1 · Published 2026-07-14

A security flaw exists in a .NET library used by developers to encrypt and decrypt XML data. An attacker could exploit this to bypass encryption protections, potentially allowing them to read or modify sensitive information that was supposed to be secure. This could lead to unauthorized data access or a breach of confidentiality for applications using this specific .NET component.

Technologies: Microsoft Visual Studio 2022, System.Security.Cryptography.Xml (NuGet). Vendors: Microsoft, NuGet.

Quick answers

Is CVE-2026-47304 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-47304 being exploited in the wild.
How severe is CVE-2026-47304?
High severity, with a CVSS score of 8.1, published 14 July 2026.
Which products and versions are affected?
Microsoft Visual Studio 2022 17.12.0 to 17.12.22; System.Security.Cryptography.Xml (NuGet) ECOSYSTEM:introduced=10.0.0,fixed=10.0.10.
Is there a fix for CVE-2026-47304?
Yes. System.Security.Cryptography.Xml (NuGet): upgrade to 10.0.10 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-47304 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-47304?
Check whether you run Microsoft Visual Studio 2022 or System.Security.Cryptography.Xml (NuGet) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • System.Security.Cryptography.Xml (NuGet): upgrade to 10.0.10 or later
    dotnet add package System.Security.Cryptography.Xml --version 10.0.10

Technical details

A security feature bypass vulnerability exists in the EncryptedXml implementation within the System.Security.Cryptography.Xml package for .NET 8, 9, and 10. The root cause is improper verification of cryptographic signatures (CWE-347), which allows an attacker to bypass encryption protections. Exploitation requires a network-based attack with high complexity but no user interaction or prior privileges. Successful exploitation allows an attacker to access or modify encrypted data. Patches are available in versions 8.0.29, 9.0.18, and 10.0.10.

Affected products

  • Microsoft System.Security.Cryptography.Xml >= 8.0.0, <= 8.0.28
  • Microsoft System.Security.Cryptography.Xml >= 9.0.0, <= 9.0.17
  • Microsoft System.Security.Cryptography.Xml >= 10.0.0, <= 10.0.9

Identifiers

  • CVE-2026-47304
  • GHSA-g8r8-53c2-pm3f

Timeline

  • 2026-07-14: disclosed: Initial advisory publication
  • 2026-07-20: advisory: GitHub Advisory updated

References

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