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CVE-2026-47304 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-14T19:17:08.830Z and has not been modified since then. This HIGH severity vulnerability in .NET, with a CVSS score of 8.1, is caused by improper verification of cryptographic signatures, allowing an unauthorized attacker to bypass a security feature over a network. Security teams and administrators responsible for .NET applications and infrastructure should be aware of this vulnerability and review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Vendor
Microsoft
Product
Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8)
CVSS
HIGH 8.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-21
Advisory published
2026-07-14
Advisory updated
2026-07-21

Who should care

Security teams and administrators responsible for .NET applications and infrastructure should be aware of this vulnerability and review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. They should also implement additional security measures, such as network segmentation and monitoring, to detect and prevent potential attacks.

Technical summary

CVE-2026-47304 is a HIGH severity vulnerability in .NET, with a CVSS score of 8.1. The vulnerability is caused by improper verification of cryptographic signatures, allowing an unauthorized attacker to bypass a security feature over a network. This vulnerability affects .NET applications and infrastructure, and security teams and administrators should review and update .NET applications and infrastructure to ensure the latest security patches are applied.

Defensive priority

High priority due to high CVSS score and potential impact on .NET applications.

Recommended defensive actions

  • Review and update .NET applications and infrastructure to ensure the latest security patches are applied.
  • Implement additional security measures, such as network segmentation and monitoring, to detect and prevent potential attacks.
  • Verify the authenticity of cryptographic signatures to prevent bypassing of security features.
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.

Evidence notes

The CVE record and NVD detail provide limited information about the vulnerability. Further investigation and verification of the vulnerability and its impact are necessary. The official CVE record and NVD detail should be reviewed to validate affected scope, severity, and vendor guidance. Additional security measures, such as network segmentation and monitoring, should be implemented to detect and prevent potential attacks.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-14T19:17:08.830Z and has not been modified since then.