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GHSA-3fx3-85r4-8j3w

GitHub Security Advisory

Microsoft Security Advisory CVE-2023-36558: .NET Security Feature Bypass Vulnerability

✓ GitHub Reviewed MODERATE Has CVE

Advisory Details

# Microsoft Security Advisory CVE-2023-36558: .NET Security Feature Bypass Vulnerability

## <a name="executive-summary"></a>Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core 6.0, ASP.NET Core 7.0 and, ASP.NET Core 8.0 RC2. This advisory also provides guidance on what developers can do to update their applications to address this vulnerability.

A security feature bypass vulnerability exists in ASP.NET where an unauthenticated user is able to bypass validation on Blazor server forms which could trigger unintended actions.

## Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/288

### <a name="mitigation-factors"></a>Mitigation factors

This vulnerability only affects ASP.NET Core Blazor apps. Other application types, including ASP.NET Core apps which do not utilize Blazor, are not affected.

## <a name="affected-software"></a>Affected software

* Any ASP.NET Core Blazor 6.0 application running on .NET 6.0.24 or earlier.
* Any ASP.NET Core Blazor 7.0 application running on .NET 7.0.13 or earlier.
* Any ASP.NET Core Blazor 8.0 application running on .NET 8.0 RC2.

If your application uses the following package versions, ensure you update to the latest version of .NET.

### <a name=".NET 7"></a>.NET 8.0

Package name | Affected version | Patched version
------------ | ---------------- | -------------------------
[Microsoft.AspNetCore.Components](https://www.nuget.org/packages/Microsoft.AspNetCore.Components/8.0.0-rc.2.23480.2) | 8.0.0-rc.2.23480.2 | 8.0.0

### <a name=".NET 7"></a>.NET 7.0

Package name | Affected version | Patched version
------------ | ---------------- | -------------------------
[Microsoft.AspNetCore.Components](https://www.nuget.org/packages/Microsoft.AspNetCore.Components) | >= 7.0.0, < 7.0.13> | 7.0.14

### <a name=".NET 7"></a>.NET 6.0

Package name | Affected version | Patched version
------------ | ---------------- | -------------------------
[Microsoft.AspNetCore.Components](https://www.nuget.org/packages/Microsoft.AspNetCore.Components) | >= 6.0.0, < 6.0.24 | 6.0.25

## Advisory FAQ

### <a name="how-affected"></a>How do I know if I am affected?

If you have a runtime or SDK with a version listed, or an affected package listed in [affected software](#affected-software), you're exposed to the vulnerability.

### <a name="how-fix"></a>How do I fix the issue?

* To fix the issue please install the latest version of .NET 6.0 or .NET 7.0. If you have installed one or more .NET SDKs through Visual Studio, Visual Studio will prompt you to update Visual Studio, which will also update your .NET SDKs.
* If you are using one of the affected packages, please update to the patched version listed above.
* If you have .NET 6.0 or greater installed, you can list the versions you have installed by running the `dotnet --info` command. You will see output like the following;

```
.NET Core SDK (reflecting any global.json):

Version: 7.0.200
Commit: 8473146e7d

Runtime Environment:

OS Name: Windows
OS Version: 10.0.18363
OS Platform: Windows
RID: win10-x64
Base Path: C:\Program Files\dotnet\sdk\7.0.300\

Host (useful for support):

Version: 76.0.5
Commit: 8473146e7d

.NET Core SDKs installed:

7.0.200 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:

Microsoft.AspNetCore.App 7.0.5 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 7.0.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 7.0.5 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET Core runtimes or SDKs:
https://aka.ms/dotnet-download
```

* If you're using .NET 8.0, you should download and install .NET 8.0.0 Runtime or .NET 8.0.100 SDK (for Visual Studio 2022 v17.8) from https://dotnet.microsoft.com/download/dotnet-core/8.0.
* If you're using .NET 7.0, you should download and install Runtime 7.0.14 or SDK 7.0.114 (for Visual Studio 2022 v17.4) from https://dotnet.microsoft.com/download/dotnet-core/7.0.
* If you're using .NET 6.0, you should download and install Runtime 6.0.25 or SDK 6.0.317 (for Visual Studio 2022 v17.2) from https://dotnet.microsoft.com/download/dotnet-core/6.0.

.NET 7.0 updates are also available from Microsoft Update. To access this either type "Check for updates" in your Windows search, or open Settings, choose Update & Security and then click Check for Updates.

Once you have installed the updated runtime or SDK, restart your apps for the update to take effect.

Additionally, if you've deployed [self-contained applications](https://docs.microsoft.com/dotnet/core/deploying/#self-contained-deployments-scd) targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed.

## Other Information

### Reporting Security Issues

If you have found a potential security issue in .NET 8.0 or .NET 7.0 or .NET 6.0, please email details to [email protected]. Reports may qualify for the Microsoft .NET Core & .NET 5 Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at <https://aka.ms/corebounty>.

### Support

You can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime and https://github.com/dotnet/aspnet/. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue.

### Disclaimer

The information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

### External Links

[CVE-2023-36558]( https://www.cve.org/CVERecord?id=CVE-2023-36558)

### Revisions

V1.0 (November 14, 2023): Advisory published.

_Version 1.0_

_Last Updated 2023-11-14_

Affected Packages

NuGet Microsoft.AspNetCore.Components
Affected versions: 8.0.0-rc.2.23480.2 (fixed in 8.0.0)
NuGet Microsoft.AspNetCore.Components
Affected versions: 7.0.0 (fixed in 7.0.14)
NuGet Microsoft.AspNetCore.Components
Affected versions: 6.0.0 (fixed in 6.0.25)

Related CVEs

Key Information

GHSA ID
GHSA-3fx3-85r4-8j3w
Published
November 14, 2023 8:36 PM
Last Modified
November 15, 2023 6:07 PM
CVSS Score
5.0 /10
Primary Ecosystem
NuGet
Primary Package
Microsoft.AspNetCore.Components
GitHub Reviewed
✓ Yes

Dataset

Last updated: July 28, 2025 6:37 AM

Data from GitHub Advisory Database. This information is provided for research and educational purposes.