# CefSharp affected by incorrect handle provided in unspecified circumstances in Mojo on Windows

Source: https://junglewise.ai/threats/cefsharp-affected-by-incorrect-handle-provided-in-unspecified-958dc7cd  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-04-12  
License: CC BY 4.0 with a link back

Severity: low · CVSS 3.1 · Published 2025-04-12

CefSharp affected by incorrect handle provided in unspecified circumstances in Mojo on Windows

Technologies: [CefSharp.WinForms (NuGet)](https://junglewise.ai/threats/technologies/cefsharp-winforms), [CefSharp.Wpf (NuGet)](https://junglewise.ai/threats/technologies/cefsharp-wpf), [CefSharp.Wpf.HwndHost (NuGet)](https://junglewise.ai/threats/technologies/cefsharp-wpf-hwndhost). Vendors: [NuGet](https://junglewise.ai/threats/vendors/nuget).

## Quick answers

**Is This vulnerability exploited in the wild?** No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

**How severe is This vulnerability?** Low severity, with a CVSS score of 3.1, published 12 April 2025.

**Which products and versions are affected?** CefSharp.OffScreen (NuGet) ECOSYSTEM:introduced=0,fixed=134.3.90; CefSharp.OffScreen.NetCore (NuGet) ECOSYSTEM:introduced=0,fixed=134.3.90; CefSharp.WinForms (NuGet) ECOSYSTEM:introduced=0,fixed=134.3.90; CefSharp.WinForms.NetCore (NuGet) ECOSYSTEM:introduced=0,fixed=134.3.90; and 3 more.

**Is there a fix for This vulnerability?** Yes. CefSharp.OffScreen (NuGet): upgrade to 134.3.90 or later; CefSharp.OffScreen.NetCore (NuGet): upgrade to 134.3.90 or later; CefSharp.WinForms (NuGet): upgrade to 134.3.90 or later; CefSharp.WinForms.NetCore (NuGet): upgrade to 134.3.90 or later; CefSharp.Wpf (NuGet): upgrade to 134.3.90 or later; CefSharp.Wpf.HwndHost (NuGet): upgrade to 134.3.90 or later; CefSharp.Wpf.NetCore (NuGet): upgrade to 134.3.90 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected?** Check whether you run CefSharp.OffScreen (NuGet), CefSharp.OffScreen.NetCore (NuGet), CefSharp.WinForms (NuGet) or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- CefSharp.OffScreen (NuGet): upgrade to 134.3.90 or later

  ```sh
  dotnet add package CefSharp.OffScreen --version 134.3.90
  ```

- CefSharp.OffScreen.NetCore (NuGet): upgrade to 134.3.90 or later

  ```sh
  dotnet add package CefSharp.OffScreen.NetCore --version 134.3.90
  ```

- CefSharp.WinForms (NuGet): upgrade to 134.3.90 or later

  ```sh
  dotnet add package CefSharp.WinForms --version 134.3.90
  ```

- CefSharp.WinForms.NetCore (NuGet): upgrade to 134.3.90 or later

  ```sh
  dotnet add package CefSharp.WinForms.NetCore --version 134.3.90
  ```

- CefSharp.Wpf (NuGet): upgrade to 134.3.90 or later

  ```sh
  dotnet add package CefSharp.Wpf --version 134.3.90
  ```

- CefSharp.Wpf.HwndHost (NuGet): upgrade to 134.3.90 or later

  ```sh
  dotnet add package CefSharp.Wpf.HwndHost --version 134.3.90
  ```

- CefSharp.Wpf.NetCore (NuGet): upgrade to 134.3.90 or later

  ```sh
  dotnet add package CefSharp.Wpf.NetCore --version 134.3.90
  ```


## Affected products

- CefSharp.OffScreen (NuGet) ECOSYSTEM:introduced=0,fixed=134.3.90
- CefSharp.OffScreen.NetCore (NuGet) ECOSYSTEM:introduced=0,fixed=134.3.90
- CefSharp.WinForms (NuGet) ECOSYSTEM:introduced=0,fixed=134.3.90
- CefSharp.WinForms.NetCore (NuGet) ECOSYSTEM:introduced=0,fixed=134.3.90
- CefSharp.Wpf (NuGet) ECOSYSTEM:introduced=0,fixed=134.3.90
- CefSharp.Wpf.HwndHost (NuGet) ECOSYSTEM:introduced=0,fixed=134.3.90
- CefSharp.Wpf.NetCore (NuGet) ECOSYSTEM:introduced=0,fixed=134.3.90

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