Summary
Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
According to the CVSS metric, the attack vector is network (AV:N) and user interaction is required (UI:R). What is the target context of the remote code execution?
This attack requires a user to open a specially crafted file from the attacker to initiate remote code execution.
Security updates
11.0.0-rc.2 — https://github.com/dotnet/announcements/issues/471
10.0.13 — https://support.microsoft.com/help/5130036
8.0.32 — https://support.microsoft.com/help/5130034
9.0.21 — https://support.microsoft.com/help/5130035
17.14.42 — https://learn.microsoft.com/en-us/visualstudio/releases/2022/release-notes
18.10.4 — https://learn.microsoft.com/en-us/visualstudio/releases/2026/release-notes
Vulnerabilities 1
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High 8.8
.NET Remote Code Execution Vulnerability
Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.
Revision history
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#2
Updated the Security Updates table to add KB article links for .NET 11.0 and download and KB article links for Microsoft Visual Studio. This is an informational change only; the fixed builds are unchanged.
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#1
Information published.
References
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CVE-2026-87697 .NET Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-87697
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss