CVE-2026-96234
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.NET Origin Validation Error Leads to Information Disclosure

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Microsoft Corporation

Description
Origin validation error in .NET allows an unauthorized attacker to disclose information over a network.

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Meta Information

Published
2026-10-13
Last Modified
2026-10-13
Generated
2026-10-19
AI Q&A
2026-10-13
EPSS Evaluated
2026-10-18
NVD
CVE-2026-96234
EUVD
EUVD-2026-100207

Affected Vendors & Products

Showing 6 associated CPEs
Vendor Product Version / Range
Microsoft .NET 10.0 10.0.0
Microsoft .NET 11.0 11.0.0
Microsoft .NET 8.0 8.0.0
Microsoft .NET 9.0 9.0.0
Microsoft Microsoft Visual Studio 2022 version 17.14 17.14.0
Microsoft Microsoft Visual Studio 2026 version 18.10 18.10.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-346 The product does not properly verify that the source of data or communication is valid.

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Executive Summary

This vulnerability is an origin validation error in .NET that allows an unauthorized attacker to disclose information over a network. It affects multiple versions of .NET and Visual Studio.

Detection Guidance

Detection requires monitoring network traffic for unauthorized information disclosure attempts. Check for unusual outbound data flows from .NET applications. Inspect logs for origin validation failures in .NET components. Use network monitoring tools like Wireshark to analyze traffic patterns.

Impact Analysis

An attacker could exploit this to access sensitive information transmitted over a network. The impact is limited to information disclosure, with no direct modification or disruption of systems.

Compliance Impact

This vulnerability allows unauthorized information disclosure over a network, which could lead to unauthorized access to sensitive data. This may violate GDPR's data protection principles and HIPAA's security requirements for safeguarding protected health information.

Mitigation Strategies

Apply the latest security updates from Microsoft for .NET 8.0, 9.0, 10.0, and 11.0, as well as Visual Studio 2022 and 2026. Monitor Microsoft's security advisories for patches addressing origin validation errors.

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