Microsoft Security Advisory CVE-2026-114146 - ASP.NET Core Elevation of Privilege Vulnerability

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

9.0 · CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C

EPSS

No dated EPSS signal available.

As published by the source; long descriptions are shortened.

Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core. This advisory provides guidance on updating affected applications and components. SignalR connections are not consistently bound to the identity negotiated at connection establishment, allowing injected messages to execute Hub invocations as the victim.

Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/504

CVSS Details - Version: 3.1 - Severity: Critical - Score: 9.0 (base score) - Vector: `CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C` - Weakness: CWE-863

Affected Platforms - Platforms: Windows, Linux, macOS - Architectures: All

Affected Packages The tables list affected version ranges and fixed package versions. Runtime and standalone deliveries are listed separately.

ASP.NET Core 2.3 - standalone packages Package | Affected version | Patched…

Published by the source

11 Nov 2026, 00:21 UTC

Last modified by the source

11 Nov 2026, 00:30 UTC

Source last checked

11 Nov 2026, 07:45 UTC

1. Revision 2 · amended · 11 Nov 2026

   Amended from osv record GHSA-67wp-ghc2-fw2g

2. Revision 1 · created · 11 Nov 2026

   Published from ghsa record GHSA-67wp-ghc2-fw2g

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# Patch Next advisory brief: CVE-2026-114146

Advisory: Microsoft Security Advisory CVE-2026-114146 - ASP.NET Core Elevation of Privilege Vulnerability
IDs: CVE-2026-114146, GHSA-67wp-ghc2-fw2g
Record: https://patchnext.com/advisories/cve-2026-114146 (revision 2, source checked 11 Nov 2026, 07:45 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.0)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: microsoft.aspnetcore.app.runtime.linux-arm64 11.0.0, 10.0.15, 9.0.23, 8.0.34; microsoft.aspnetcore.app.runtime.linux-musl-arm64 11.0.0, 10.0.15, 9.0.23, 8.0.34; microsoft.aspnetcore.app.runtime.osx-x64 11.0.0, 10.0.15, 9.0.23, 8.0.34; microsoft.aspnetcore.app.runtime.linux-arm 11.0.0, 10.0.15, 9.0.23, 8.0.34; microsoft.aspnetcore.app.runtime.win-x86 11.0.0, 10.0.15, 9.0.23, 8.0.34; microsoft.aspnetcore.app.runtime.linux-x64 11.0.0, 10.0.15, 9.0.23, 8.0.34; microsoft.aspnetcore.app.runtime.linux-musl-arm 11.0.0, 10.0.15, 9.0.23, 8.0.34; microsoft.aspnetcore.app.runtime.linux-musl-x64 11.0.0, 10.0.15, 9.0.23, 8.0.34; microsoft.aspnetcore.app.runtime.osx-arm64 11.0.0, 10.0.15, 9.0.23, 8.0.34; microsoft.aspnetcore.app.runtime.win-x64 11.0.0, 10.0.15, 9.0.23, 8.0.34; microsoft.aspnetcore.http.connections 1.2.14; microsoft.aspnetcore.app.runtime.win-arm64 11.0.0, 10.0.15, 9.0.23, 8.0.34. A vendor fix does not mean a deployment is fixed.

## Affected components
- NuGet microsoft.aspnetcore.app.runtime.linux-arm64: affected >= 8.0.0-preview.1.23112.2, < 8.0.34; >= 9.0.0-preview.1.24081.5, < 9.0.23; >= 10.0.0-preview.1.25120.3, < 10.0.15; >= 11.0.0-preview.1.26104.118, < 11.0.0; fixed in 9.0.23, 8.0.34, 10.0.15, 11.0.0
- NuGet microsoft.aspnetcore.app.runtime.linux-musl-arm64: affected >= 8.0.0-preview.1.23112.2, < 8.0.34; >= 9.0.0-preview.1.24081.5, < 9.0.23; >= 10.0.0-preview.1.25120.3, < 10.0.15; >= 11.0.0-preview.1.26104.118, < 11.0.0; fixed in 9.0.23, 8.0.34, 10.0.15, 11.0.0
- NuGet microsoft.aspnetcore.app.runtime.osx-x64: affected >= 8.0.0-preview.1.23112.2, < 8.0.34; >= 9.0.0-preview.1.24081.5, < 9.0.23; >= 10.0.0-preview.1.25120.3, < 10.0.15; >= 11.0.0-preview.1.26104.118, < 11.0.0; fixed in 9.0.23, 8.0.34, 10.0.15, 11.0.0
- NuGet microsoft.aspnetcore.app.runtime.linux-arm: affected >= 8.0.0-preview.1.23112.2, < 8.0.34; >= 9.0.0-preview.1.24081.5, < 9.0.23; >= 10.0.0-preview.1.25120.3, < 10.0.15; >= 11.0.0-preview.1.26104.118, < 11.0.0; fixed in 9.0.23, 8.0.34, 10.0.15, 11.0.0
- NuGet microsoft.aspnetcore.app.runtime.win-x86: affected >= 8.0.0-preview.1.23112.2, < 8.0.34; >= 9.0.0-preview.1.24081.5, < 9.0.23; >= 10.0.0-preview.1.25120.3, < 10.0.15; >= 11.0.0-preview.1.26104.118, < 11.0.0; fixed in 9.0.23, 8.0.34, 10.0.15, 11.0.0
- NuGet microsoft.aspnetcore.app.runtime.linux-x64: affected >= 8.0.0-preview.1.23112.2, < 8.0.34; >= 9.0.0-preview.1.24081.5, < 9.0.23; >= 10.0.0-preview.1.25120.3, < 10.0.15; >= 11.0.0-preview.1.26104.118, < 11.0.0; fixed in 9.0.23, 8.0.34, 10.0.15, 11.0.0
- NuGet microsoft.aspnetcore.app.runtime.linux-musl-arm: affected >= 8.0.0-preview.1.23112.2, < 8.0.34; >= 9.0.0-preview.1.24081.5, < 9.0.23; >= 10.0.0-preview.1.25120.3, < 10.0.15; >= 11.0.0-preview.1.26104.118, < 11.0.0; fixed in 9.0.23, 8.0.34, 10.0.15, 11.0.0
- NuGet microsoft.aspnetcore.app.runtime.linux-musl-x64: affected >= 8.0.0-preview.1.23112.2, < 8.0.34; >= 9.0.0-preview.1.24081.5, < 9.0.23; >= 10.0.0-preview.1.25120.3, < 10.0.15; >= 11.0.0-preview.1.26104.118, < 11.0.0; fixed in 9.0.23, 8.0.34, 10.0.15, 11.0.0
- NuGet microsoft.aspnetcore.app.runtime.osx-arm64: affected >= 8.0.0-preview.1.23112.2, < 8.0.34; >= 9.0.0-preview.1.24081.5, < 9.0.23; >= 10.0.0-preview.1.25120.3, < 10.0.15; >= 11.0.0-preview.1.26104.118, < 11.0.0; fixed in 9.0.23, 8.0.34, 10.0.15, 11.0.0
- NuGet microsoft.aspnetcore.app.runtime.win-x64: affected >= 8.0.0-preview.1.23112.2, < 8.0.34; >= 9.0.0-preview.1.24081.5, < 9.0.23; >= 10.0.0-preview.1.25120.3, < 10.0.15; >= 11.0.0-preview.1.26104.118, < 11.0.0; fixed in 9.0.23, 8.0.34, 10.0.15, 11.0.0
- NuGet microsoft.aspnetcore.http.connections: affected >= 1.2.0, < 1.2.14; fixed in 1.2.14
- NuGet microsoft.aspnetcore.app.runtime.win-arm64: affected >= 8.0.0-preview.1.23112.2, < 8.0.34; >= 9.0.0-preview.1.24081.5, < 9.0.23; >= 10.0.0-preview.1.25120.3, < 10.0.15; >= 11.0.0-preview.1.26104.118, < 11.0.0; fixed in 9.0.23, 8.0.34, 10.0.15, 11.0.0

## Suggested inspection (read-only)
- NuGet microsoft.aspnetcore.app.runtime.linux-arm64: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.app.runtime.linux-musl-arm64: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.app.runtime.osx-x64: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.app.runtime.linux-arm: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.app.runtime.win-x86: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.app.runtime.linux-x64: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.app.runtime.linux-musl-arm: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.app.runtime.linux-musl-x64: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.app.runtime.osx-arm64: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.app.runtime.win-x64: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.http.connections: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.app.runtime.win-arm64: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on microsoft.aspnetcore.app.runtime.linux-arm64, microsoft.aspnetcore.app.runtime.linux-musl-arm64, microsoft.aspnetcore.app.runtime.osx-x64, microsoft.aspnetcore.app.runtime.linux-arm, microsoft.aspnetcore.app.runtime.win-x86, microsoft.aspnetcore.app.runtime.linux-x64, microsoft.aspnetcore.app.runtime.linux-musl-arm, microsoft.aspnetcore.app.runtime.linux-musl-x64, microsoft.aspnetcore.app.runtime.osx-arm64, microsoft.aspnetcore.app.runtime.win-x64, microsoft.aspnetcore.http.connections, microsoft.aspnetcore.app.runtime.win-arm64.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-67wp-ghc2-fw2g (GitHub-reviewed advisory GHSA-67wp-ghc2-fw2g lists affected ranges: NuGet microsoft.aspnetcore.http.connections >=1.2.0 =8.0.0-preview.1.23112.2 =9.0.0-preview.1.24081.5 =10.0.0-preview.1.25120.3 =11.0.0-preview.1.26104.118 =8.0.0-preview.1.23112.2 =9.0.0-preview.1.24081.5 =10.0.0-preview.1.25120.3…)
- Verified: https://osv.dev/vulnerability/GHSA-67wp-ghc2-fw2g (OSV record GHSA-67wp-ghc2-fw2g lists affected ranges: NuGet microsoft.aspnetcore.http.connections >=1.2.0 =8.0.0-preview.1.23112.2 =9.0.0-preview.1.24081.5 =10.0.0-preview.1.25120.3 =11.0.0-preview.1.26104.118 =8.0.0-preview.1.23112.2 =9.0.0-preview.1.24081.5 <9.0.23 (fixed),…)

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