CVE-2026-96234

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.NET Origin Validation Error Leads to Information Disclosure

Publication date: 2026-10-13

Last updated on: 2026-10-22

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

2026-10-22

Generated

2026-11-08

AI Q&A

2026-10-13

EPSS Evaluated

2026-11-07

NVD

CVE-2026-96234

EUVD

EUVD-2026-100207

Affected Vendors & Products

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

KEV

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

Attack-Flow Graph

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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