# CVE-2026-109481: Microsoft ASP.NET Core cross-site request forgery privilege escalation

Source: https://junglewise.ai/threats/cve-2026-109481-cross-site-request-forgery-csrf-in-asp-net-core-allows-an  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-109481 · Severity: high · CVSS 7.5 · Published 2026-11-10

ASP.NET Core is a framework for building web applications. A cross-site request forgery (CSRF) vulnerability allows an attacker to trick authenticated users into performing unwanted actions, potentially leading to privilege escalation. An attacker could gain elevated access to sensitive application functionality without proper authorization.

Technologies: [Microsoft Asp.Net Core](https://junglewise.ai/threats/technologies/asp-net-core), [Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-app-runtime-linux-arm), [Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-app-runtime-linux-arm64), [Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-app-runtime-linux-musl-arm), [Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-app-runtime-linux-musl-arm64), [Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-app-runtime-linux-musl-x64), [Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-app-runtime-linux-x64), [Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-app-runtime-osx-arm64), [Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-app-runtime-osx-x64), [Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-app-runtime-win-arm64), [Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-app-runtime-win-x64), [Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-app-runtime-win-x86). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft), [NuGet](https://junglewise.ai/threats/vendors/nuget).

## Quick answers

**Is CVE-2026-109481 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-109481 being exploited in the wild.

**How severe is CVE-2026-109481?** High severity, with a CVSS score of 7.5, published 10 November 2026.

**Which products and versions are affected?** Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet) >= 11.0.0-preview.6.26359.118, <= 11.0.0-rc.3.26522.148, ECOSYSTEM:introduced=11.0.0-preview.6.26359.118,fixed=11.0.0; Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet) >= 11.0.0-preview.6.26359.118, <= 11.0.0-rc.3.26522.148, ECOSYSTEM:introduced=11.0.0-preview.6.26359.118,fixed=11.0.0; Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet) >= 11.0.0-preview.6.26359.118, <= 11.0.0-rc.3.26522.148, ECOSYSTEM:introduced=11.0.0-preview.6.26359.118,fixed=11.0.0; Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet) >= 11.0.0-preview.6.26359.118, <= 11.0.0-rc.3.26522.148, ECOSYSTEM:introduced=11.0.0-preview.6.26359.118,fixed=11.0.0; and 7 more.

**Is there a fix for CVE-2026-109481?** Yes. Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet): upgrade to 11.0.0 or later; Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet): upgrade to 11.0.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-109481 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-109481?** Check whether you run Microsoft Asp.Net Core, Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet), Microsoft.AspNetCore.App.Runtime.linux-arm64 (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

- Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): upgrade to 11.0.0 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.App.Runtime.linux-arm --version 11.0.0
  ```

- Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): upgrade to 11.0.0 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.App.Runtime.linux-arm64 --version 11.0.0
  ```

- Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet): upgrade to 11.0.0 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.App.Runtime.linux-musl-arm --version 11.0.0
  ```

- Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet): upgrade to 11.0.0 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 --version 11.0.0
  ```

- Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet): upgrade to 11.0.0 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.App.Runtime.linux-musl-x64 --version 11.0.0
  ```

- Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet): upgrade to 11.0.0 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.App.Runtime.linux-x64 --version 11.0.0
  ```

- Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet): upgrade to 11.0.0 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.App.Runtime.osx-arm64 --version 11.0.0
  ```

- Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet): upgrade to 11.0.0 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.App.Runtime.osx-x64 --version 11.0.0
  ```

- Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet): upgrade to 11.0.0 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.App.Runtime.win-arm64 --version 11.0.0
  ```

- Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet): upgrade to 11.0.0 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.App.Runtime.win-x64 --version 11.0.0
  ```

- Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet): upgrade to 11.0.0 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.App.Runtime.win-x86 --version 11.0.0
  ```


## Technical details

A CSRF vulnerability in ASP.NET Core permits an attacker to forge requests from authenticated users, bypassing anti-CSRF protections to escalate privileges. The attack requires network access and relies on social engineering or user interaction to trick a victim into visiting a malicious site. An attacker can exploit this to perform administrative actions or access restricted resources under the victim's user context.

## Affected products

- Microsoft ASP.NET Core

## Identifiers

- CVE-2026-109481
- GHSA-xw2x-23jm-j582

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-109481](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-109481)

## Related threats

- [Microsoft ASP.NET Core race condition privilege escalation](https://junglewise.ai/threats/duplicate-advisory-microsoft-security-advisory-asp-net-core-security-04275796)
- [Microsoft ASP.NET Core denial of service via resource consumption](https://junglewise.ai/threats/duplicate-advisory-microsoft-security-advisory-asp-net-core-denial-of-0f1476a7)
- [ASP.NET Core security feature bypass via input validation](https://junglewise.ai/threats/duplicate-advisory-microsoft-security-advisory-asp-net-core-security-942d98c7)
- [ASP.NET Core inefficient algorithmic complexity denial of service](https://junglewise.ai/threats/duplicate-advisory-microsoft-security-advisory-asp-net-core-denial-of-f3e14a11)
- [Microsoft ASP.NET Core denial of service via resource allocation](https://junglewise.ai/threats/cve-2026-118750-allocation-of-resources-without-limits-or-throttling-in-asp-net)