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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👁 4 Views

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

Related
Detection
Refs
ReporterTitlePublishedViews
Family
circl
Circl		CVE-2026-66822
13 Oct 202611:56
–circl
cve
CVE		CVE-2026-66822
13 Oct 202618:59
–cve
cvelist
Cvelist		CVE-2026-66822 .NET Information Disclosure Vulnerability
13 Oct 202618:59
–cvelist
euvd
EUVD		EUVD-2026-99277
13 Oct 202618:59
–euvd
mskb
Microsoft KB		.NET 8.0 Update - October 13, 2026
13 Oct 202614:00
–mskb
mskb
Microsoft KB		.NET 9.0 Update - October 13, 2026
13 Oct 202614:00
–mskb
mskb
Microsoft KB		.NET 10.0 Update - October 13, 2026
13 Oct 202614:00
–mskb
mend
Mend		CVE-2026-66822
13 Oct 202618:59
–mend
mscve
Microsoft CVE		.NET Information Disclosure Vulnerability
13 Oct 202614:00
–mscve
ncsc
NCSC		vulnerabilities handled in Microsoft Developer Tools
13 Oct 202618:56
–ncsc
Rows per page
Vulners
Node
OR
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
microsoftnetcore.app.runtime.linux-musl-armRange8.0.0–8.0.31nuget
microsoftnetcore.app.runtime.linux-arm64Range8.0.0–8.0.31nuget
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
microsoftnetcore.app.runtime.osx-x64Range10.0.0–10.0.12nuget
microsoftnetcore.app.runtime.osx-arm64Range10.0.0–10.0.12nuget
microsoftnetcore.app.runtime.linux-x64Range10.0.0–10.0.12nuget
microsoftnetcore.app.runtime.linux-musl-x64Range10.0.0–10.0.12nuget
microsoftnetcore.app.runtime.linux-musl-arm64Range10.0.0–10.0.12nuget
microsoftnetcore.app.runtime.linux-musl-armRange10.0.0–10.0.12nuget
microsoftnetcore.app.runtime.linux-arm64Range10.0.0–10.0.12nuget
microsoftnetcore.app.runtime.linux-armRange10.0.0–10.0.12nuget
microsoftnetcore.app.runtime.win-x86Range11.0.0-preview.1–11.0.0-rc.1nuget
microsoftnetcore.app.runtime.win-x64Range11.0.0-preview.1–11.0.0-rc.1nuget
microsoftnetcore.app.runtime.win-arm64Range11.0.0-preview.1–11.0.0-rc.1nuget
microsoftnetcore.app.runtime.osx-x64Range11.0.0-preview.1–11.0.0-rc.1nuget
microsoftnetcore.app.runtime.osx-arm64Range11.0.0-preview.1–11.0.0-rc.1nuget
microsoftnetcore.app.runtime.linux-x64Range11.0.0-preview.1–11.0.0-rc.1nuget
microsoftnetcore.app.runtime.linux-musl-x64Range11.0.0-preview.1–11.0.0-rc.1nuget
microsoftnetcore.app.runtime.linux-musl-arm64Range11.0.0-preview.1–11.0.0-rc.1nuget
microsoftnetcore.app.runtime.linux-musl-armRange11.0.0-preview.1–11.0.0-rc.1nuget
microsoftnetcore.app.runtime.linux-arm64Range11.0.0-preview.1–11.0.0-rc.1nuget
microsoftnetcore.app.runtime.linux-armRange11.0.0-preview.1–11.0.0-rc.1nuget
microsoftnetcore.app.runtime.win-x86Range9.0.0–9.0.20nuget
microsoftnetcore.app.runtime.win-x64Range9.0.0–9.0.20nuget
microsoftnetcore.app.runtime.win-arm64Range9.0.0–9.0.20nuget
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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13 Oct 2026 20:41Current
5.5Medium risk
Vulners AI Score5.5
CVSS 3.15.9
CWE-201
.NETSystem.Net.HttpSocketsHttpHandlerProxy-Authorizationinformation disclosureproxy credentials
4