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Microsoft Security Advisory CVE-2026-66822 - .NET and Visual Studio Information Disclosure Vulnerability

🗓️ 13 Oct 2026 20:41:40Reported by GitHub Advisory DatabaseType 
github
 github🔗 github.com👁 24 Views

SocketsHttpHandler in .NET leaks basic proxy credentials via Proxy-Authorization header.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
nessus
Tenable Nessus		Amazon Linux 2023 : aspnetcore-runtime-9.0, aspnetcore-runtime-dbg-9.0, aspnetcore-targeting-pack-9.0 (ALAS2023-2026-3248)
22 Oct 202600:00
–nessus
nessus
Tenable Nessus		AlmaLinux 10 : .NET 8.0 (ALSA-2026:86168)
21 Oct 202600:00
–nessus
nessus
Tenable Nessus		AlmaLinux 9 : .NET 8.0 (ALSA-2026:86169)
21 Oct 202600:00
–nessus
nessus
Tenable Nessus		AlmaLinux 8 : .NET 9.0 (ALSA-2026:86170)
21 Oct 202600:00
–nessus
nessus
Tenable Nessus		AlmaLinux 9 : .NET 9.0 (ALSA-2026:86171)
21 Oct 202600:00
–nessus
nessus
Tenable Nessus		AlmaLinux 10 : .NET 9.0 (ALSA-2026:86172)
21 Oct 202600:00
–nessus
nessus
Tenable Nessus		AlmaLinux 8 : .NET 10.0 (ALSA-2026:86192)
21 Oct 202600:00
–nessus
nessus
Tenable Nessus		AlmaLinux 9 : .NET 10.0 (ALSA-2026:86193)
21 Oct 202600:00
–nessus
nessus
Tenable Nessus		AlmaLinux 10 : .NET 10.0 (ALSA-2026:86195)
21 Oct 202600:00
–nessus
nessus
Tenable Nessus		AlmaLinux 8 : .NET 8.0 (ALSA-2026:86594)
21 Oct 202600:00
–nessus
Rows per page
Vulners
Node
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microsoftnetcore.app.runtime.win-x86Range8.0.0–8.0.31nuget
microsoftnetcore.app.runtime.win-x64Range8.0.0–8.0.31nuget
microsoftnetcore.app.runtime.win-arm64Range8.0.0–8.0.31nuget
microsoftnetcore.app.runtime.osx-x64Range8.0.0–8.0.31nuget
microsoftnetcore.app.runtime.osx-arm64Range8.0.0–8.0.31nuget
microsoftnetcore.app.runtime.linux-x64Range8.0.0–8.0.31nuget
microsoftnetcore.app.runtime.linux-musl-x64Range8.0.0–8.0.31nuget
microsoftnetcore.app.runtime.linux-musl-arm64Range8.0.0–8.0.31nuget
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microsoftnetcore.app.runtime.linux-armRange8.0.0–8.0.31nuget
microsoftnetcore.app.runtime.win-x86Range10.0.0–10.0.12nuget
microsoftnetcore.app.runtime.win-x64Range10.0.0–10.0.12nuget
microsoftnetcore.app.runtime.win-arm64Range10.0.0–10.0.12nuget
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microsoftnetcore.app.runtime.win-x86Range11.0.0-preview.1–11.0.0-rc.1nuget
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microsoftnetcore.app.runtime.linux-x64Range11.0.0-preview.1–11.0.0-rc.1nuget
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microsoftnetcore.app.runtime.osx-x64Range9.0.0–9.0.20nuget
microsoftnetcore.app.runtime.osx-arm64Range9.0.0–9.0.20nuget
microsoftnetcore.app.runtime.linux-x64Range9.0.0–9.0.20nuget
microsoftnetcore.app.runtime.linux-musl-x64Range9.0.0–9.0.20nuget
microsoftnetcore.app.runtime.linux-musl-arm64Range9.0.0–9.0.20nuget
microsoftnetcore.app.runtime.linux-musl-armRange9.0.0–9.0.20nuget
microsoftnetcore.app.runtime.linux-arm64Range9.0.0–9.0.20nuget
microsoftnetcore.app.runtime.linux-armRange9.0.0–9.0.20nuget

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19 Oct 2026 19:19Current
5.5Medium risk
Vulners AI Score5.5
CVSS 3.15.9
EPSS0.00785
SSVC
CWE-201
.NETSystem.Net.HttpSocketsHttpHandlerProxy-Authorizationinformation disclosureproxy credentials
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