CVE-2023-35391 ASP.NET Core SignalR and Visual Studio Information Disclosure Vulnerability
An information disclosure vulnerability in ASP.NET Core SignalR and Visual Studio allows attackers to access sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-35391?
CVE-2023-35391 is a medium-severity vulnerability in Microsoft .Net, published on 8 Aug 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
ASP.NET Core SignalR and Visual Studio Information Disclosure Vulnerability
Which versions are affected by CVE-2023-35391?
9 open source packages ship an affected version, including Microsoft.AspNetCore.SignalR.StackExchangeRedis, aspnet-core and dotnet. It affects 3 products.
| Package | Affected | Fixed in |
|---|---|---|
Microsoft.AspNetCore.SignalR.StackExchangeRedis NuGet | From 6.0.0 | 6.0.21 |
Microsoft.AspNetCore.SignalR.StackExchangeRedis NuGet | From 6.0.0 | 6.0.21 |
Microsoft.AspNetCore.SignalR.StackExchangeRedis NuGet | From 7.0.0 | 7.0.10 |
Microsoft.AspNetCore.SignalR.StackExchangeRedis NuGet | From 7.0.0 | 7.0.10 |
aspnet-core Bitnami | From 2.1.0 | 2.1.40 |
dotnet Bitnami | From 6.0.0 | 6.0.21, 7.0.10 |
3 more packages
dotnet-sdk Bitnami | From 6.0.0 | 6.0.21, 7.0.10 |
Microsoft.AspNetCore.SignalR.Redis NuGet | All versions | 1.0.40 |
Microsoft.AspNetCore.SignalR.Redis NuGet | All versions | 1.0.40 |
Products include Microsoft .Net, Microsoft Asp.net Core, Microsoft Visual Studio 2022.
How do I fix CVE-2023-35391?
Upgrade Microsoft.AspNetCore.SignalR.StackExchangeRedis to a fixed version for your release line: 6.0.21 or 7.0.10.
Is CVE-2023-35391 being exploited?
There is no known exploitation of CVE-2023-35391 in the wild and no public exploit code.
Other vulnerabilities in Microsoft .Net
- CVE-2024-43498 .NET and Visual Studio Remote Code Execution Vulnerability
- CVE-2024-0057 NET, .NET Framework, and Visual Studio Security Feature Bypass Vulnerability
- CVE-2026-96957 .NET Security Feature Bypass Vulnerability
- CVE-2026-69439 .NET and Visual Studio Elevation of Privilege Vulnerability
- CVE-2026-71328 .NET and Visual Studio Remote Code Execution Vulnerability
Sources
Also known as BIT-aspnet-core-2023-35391, BIT-dotnet-2023-35391, BIT-dotnet-sdk-2023-35391, CLEANSTART-2025-GD87360, GHSA-j8rm-cm55-qqj6.