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

• NuGet Microsoft.AspNetCore.App.Runtime.linux-arm: >= 8.0.0, < 8.0.32 → fixed in 8.0.32 • NuGet Microsoft.AspNetCore.App.Runtime.linux-arm64: >= 8.0.0, < 8.0.32 → fixed in 8.0.32 • NuGet Microsoft.AspNetCore.App.Runtime.linux-musl-arm: >= 8.0.0, < 8.0.32 → fixed in 8.0.32 • NuGet Microsoft.AspNetCore.App.Runtime.linux-musl-arm64: >= 8.0.0, < 8.0.32 → fixed in 8.0.32 • NuGet Microsoft.AspNetCore.App.Runtime.linux-musl-x64: >= 8.0.0, < 8.0.32 → fixed in 8.0.32 • NuGet Microsoft.AspNetCore.App.Runtime.linux-x64: >= 8.0.0, < 8.0.32 → fixed in 8.0.32 • NuGet Microsoft.AspNetCore.App.Runtime.osx-arm64: >= 8.0.0, < 8.0.32 → fixed in 8.0.32 • NuGet Microsoft.AspNetCore.App.Runtime.osx-x64: >= 8.0.0, < 8.0.32 → fixed in 8.0.32 • NuGet Microsoft.AspNetCore.App.Runtime.win-arm: >= 8.0.0, < 8.0.32 → fixed in 8.0.32 • NuGet Microsoft.AspNetCore.App.Runtime.win-arm64: >= 8.0.0, < 8.0.32 → fixed in 8.0.32 • NuGet Microsoft.AspNetCore.App.Runtime.win-x64: >= 8.0.0, < 8.0.32 → fixed in 8.0.32 • NuGet Microsoft.AspNetCore.App.Runtime.win-x86: >= 8.0.0, < 8.0.32 → fixed in 8.0.32 • NuGet Microsoft.AspNetCore.App.Runtime.linux-arm: >= 10.0.0, < 10.0.13 → fixed in 10.0.13 • NuGet Microsoft.AspNetCore.App.Runtime.linux-arm64: >= 10.0.0, < 10.0.13 → fixed in 10.0.13 • NuGet Microsoft.AspNetCore.App.Runtime.linux-musl-arm: >= 10.0.0, < 10.0.13 → fixed in 10.0.13 • NuGet Microsoft.AspNetCore.App.Runtime.linux-musl-arm64: >= 10.0.0, < 10.0.13 → fixed in 10.0.13 • NuGet Microsoft.AspNetCore.App.Runtime.linux-musl-x64: >= 10.0.0, < 10.0.13 → fixed in 10.0.13 • NuGet Microsoft.AspNetCore.App.Runtime.linux-x64: >= 10.0.0, < 10.0.13 → fixed in 10.0.13 • NuGet Microsoft.AspNetCore.App.Runtime.osx-arm64: >= 10.0.0, < 10.0.13 → fixed in 10.0.13 • NuGet Microsoft.AspNetCore.App.Runtime.osx-x64: >= 10.0.0, < 10.0.13 → fixed in 10.0.13 • NuGet Microsoft.AspNetCore.App.Runtime.win-arm: >= 10.0.0, < 10.0.13 → fixed in 10.0.13 • NuGet Microsoft.AspNetCore.App.Runtime.win-arm64: >= 10.0.0, < 10.0.13 → fixed in 10.0.13 • NuGet Microsoft.AspNetCore.App.Runtime.win-x64: >= 10.0.0, < 10.0.13 → fixed in 10.0.13 • NuGet Microsoft.AspNetCore.App.Runtime.win-x86: >= 10.0.0, < 10.0.13 → fixed in 10.0.13 • NuGet Microsoft.AspNetCore.App.Runtime.linux-arm: >= 9.0.0, < 9.0.21 → fixed in 9.0.21 • NuGet Microsoft.AspNetCore.App.Runtime.linux-arm64: >= 9.0.0, < 9.0.21 → fixed in 9.0.21 • NuGet Microsoft.AspNetCore.App.Runtime.linux-musl-arm: >= 9.0.0, < 9.0.21 → fixed in 9.0.21 • NuGet Microsoft.AspNetCore.App.Runtime.linux-musl-arm64: >= 9.0.0, < 9.0.21 → fixed in 9.0.21 • NuGet Microsoft.AspNetCore.App.Runtime.linux-musl-x64: >= 9.0.0, < 9.0.21 → fixed in 9.0.21 • NuGet Microsoft.AspNetCore.App.Runtime.linux-x64: >= 9.0.0, < 9.0.21 → fixed in 9.0.21 • NuGet Microsoft.AspNetCore.App.Runtime.osx-arm64: >= 9.0.0, < 9.0.21 → fixed in 9.0.21 • NuGet Microsoft.AspNetCore.App.Runtime.osx-x64: >= 9.0.0, < 9.0.21 → fixed in 9.0.21 • NuGet Microsoft.AspNetCore.App.Runtime.win-arm: >= 9.0.0, < 9.0.21 → fixed in 9.0.21 • NuGet Microsoft.AspNetCore.App.Runtime.win-arm64: >= 9.0.0, < 9.0.21 → fixed in 9.0.21 • NuGet Microsoft.AspNetCore.App.Runtime.win-x64: >= 9.0.0, < 9.0.21 → fixed in 9.0.21 • NuGet Microsoft.AspNetCore.App.Runtime.win-x86: >= 9.0.0, < 9.0.21 → fixed in 9.0.21 • NuGet Microsoft.AspNetCore.App.Runtime.linux-arm: >= 11.0.0-preview.1, < 11.0.0-rc.2 → fixed in 11.0.0-rc.2 • NuGet Microsoft.AspNetCore.App.Runtime.linux-arm64: >= 11.0.0-preview.1, < 11.0.0-rc.2 → fixed in 11.0.0-rc.2 • NuGet Microsoft.AspNetCore.App.Runtime.linux-musl-arm: >= 11.0.0-preview.1, < 11.0.0-rc.2 → fixed in 11.0.0-rc.2 • NuGet Microsoft.AspNetCore.App.Runtime.linux-musl-arm64: >= 11.0.0-preview.1, < 11.0.0-rc.2 → fixed in 11.0.0-rc.2 • NuGet Microsoft.AspNetCore.App.Runtime.linux-musl-x64: >= 11.0.0-preview.1, < 11.0.0-rc.2 → fixed in 11.0.0-rc.2 • NuGet Microsoft.AspNetCore.App.Runtime.linux-x64: >= 11.0.0-preview.1, < 11.0.0-rc.2 → fixed in 11.0.0-rc.2 • NuGet Microsoft.AspNetCore.App.Runtime.osx-arm64: >= 11.0.0-preview.1, < 11.0.0-rc.2 → fixed in 11.0.0-rc.2 • NuGet Microsoft.AspNetCore.App.Runtime.osx-x64: >= 11.0.0-preview.1, < 11.0.0-rc.2 → fixed in 11.0.0-rc.2 • NuGet Microsoft.AspNetCore.App.Runtime.win-arm: >= 11.0.0-preview.1, < 11.0.0-rc.2 → fixed in 11.0.0-rc.2 • NuGet Microsoft.AspNetCore.App.Runtime.win-arm64: >= 11.0.0-preview.1, < 11.0.0-rc.2 → fixed in 11.0.0-rc.2 • NuGet Microsoft.AspNetCore.App.Runtime.win-x64: >= 11.0.0-preview.1, < 11.0.0-rc.2 → fixed in 11.0.0-rc.2 • NuGet Microsoft.AspNetCore.App.Runtime.win-x86: >= 11.0.0-preview.1, < 11.0.0-rc.2 → fixed in 11.0.0-rc.2

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 | >= 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 11.0.0-preview.1, = 11.0.0-preview.1, = 11.0.0-preview.1, = 11.0.0-preview.1, = 11.0.0-preview.1, = 11.0.0-preview.1, = 11.0.0-preview.1, <= 11.0.0-rc.1 | 11.0.0-rc.2 [Microsoft.AspNetCore.App.Runtime.osx-x64](https://w…