fkie_cve-2026-70183

2026-10-14T16:39:05.323169+00:00

Concurrent execution using shared resource with improper synchronization ('race condition') in ASP.NET Core allows an authorized attacker to elevate privileges over a network.

GHSA-494h-xx7x-5frh — Microsoft Security Advisory CVE-2026-70183 - ASP.NET Core Security Feature Bypass Vulnerability

2026-10-14T16:39:05.323254+00:00

Affected: NuGet: Microsoft.AspNetCore.App.Runtime.linux-arm, NuGet: Microsoft.AspNetCore.App.Runtime.linux-arm64, NuGet: Microsoft.AspNetCore.App.Runtime.linux-musl-arm, NuGet: Microsoft.AspNetCore.App.Runtime.linux-musl-arm64, NuGet: Microsoft.AspNetCore.App.Runtime.linux-musl-x64, NuGet: Microsoft.AspNetCore.App.Runtime.linux-x64, NuGet: Microsoft.AspNetCore.App.Runtime.osx-arm64, NuGet: Microsoft.AspNetCore.App.Runtime.osx-x64, NuGet: Microsoft.AspNetCore.App.Runtime.win-arm, NuGet: Microsoft.AspNetCore.App.Runtime.win-arm64 and 2 more

## Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Components.Authorization. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

A stale asynchronous authorization result in Blazor `AuthorizeRouteView` can be applied after navigation or an authorization-state change, bypassing the current `[Authorize]` decision.

## Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/460

## CVSS Details

- **Version:** 3.1 - **Severity:** High - **Score:** 7.5 - **Vector:** `CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H` - **Weakness:** CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition'))

## Affected Platforms

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

## Affected Packages

The vulnerability affects Microsoft .NET projects that use an affected package version listed below.

Package name | Affected version | Patched version ------------ | ---------------- | --------------- [Microsoft.AspNetCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm) | >= 8.0.0, <= 8.0.31 | 8.0.32 [Microsoft.AspNetCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm64) | >= 8.0.0, <= 8.0.31 | 8.0.32 [Microsoft…

NCSC-2026-0426 — Kwetsbaarheden verholpen in Microsoft Developer Tools

2026-10-14T16:39:05.323447+00:00

NCSC-2026-0426

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fkie_cve-2026-70183

GHSA-494h-xx7x-5frh — Microsoft Security Advisory CVE-2026-70183 - ASP.NET Core Security Feature Bypass Vulnerability

NCSC-2026-0426 — Kwetsbaarheden verholpen in Microsoft Developer Tools