Summary
Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
How could an attacker exploit this vulnerability?
An unauthenticated attacker could supply specially crafted data to an application being debugged. If a developer evaluates an affected object during a Blazor WebAssembly debugging session, successful exploitation could allow the attacker to execute code in the developer's context. User interaction is required.
Security updates
18.10.4 — https://learn.microsoft.com/en-us/visualstudio/releases/2026/release-notes
17.14.43 — https://learn.microsoft.com/en-us/visualstudio/releases/2022/release-notes
10.0.13 — https://github.com/dotnet/announcements/issues/445
10.0.14 — https://support.microsoft.com/help/5133966
11.0.100-rc.3 — https://github.com/dotnet/core/blob/main/release-notes/11.0/preview/rc3/11.0.0-rc.3.md
16.11.61 — https://learn.microsoft.com/en-us/visualstudio/releases/2019/release-notes
18.12 Insiders 3 — https://learn.microsoft.com/en-us/visualstudio/releases/2026/release-notes-insiders
Vulnerabilities 1
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High 8.8
ASP.NET Core Remote Code Execution Vulnerability
Improper control of generation of code ('code injection') in ASP.NET Core allows an unauthorized attacker to execute code over a network.
Revision history
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#2
Updated product information in the Software Update table. This is an informational change only.
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#1
Information published.
References
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CVE-2026-102870 ASP.NET Core Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102870
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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