# CVE-2026-120778: .NET Aspire insecure temporary file creation local privilege escalation

Source: https://junglewise.ai/threats/cve-2026-120778-creation-of-temporary-file-in-directory-with-insecure  
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-2026-120778 · Severity: high · CVSS 7.3 · Published 2026-11-10

.NET Aspire is a tool used by developers to create cloud-native applications. A flaw in how temporary files are created with weak directory permissions allows an authorized local attacker to escalate their privileges on the system, potentially gaining control over the application and the data it handles.

Technologies: [Microsoft .NET Aspire](https://junglewise.ai/threats/technologies/net-aspire), [Aspire.Cli (NuGet)](https://junglewise.ai/threats/technologies/aspire-cli). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft), [npm](https://junglewise.ai/threats/vendors/npm), [NuGet](https://junglewise.ai/threats/vendors/nuget).

## Quick answers

**Is CVE-2026-120778 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-120778 being exploited in the wild.

**How severe is CVE-2026-120778?** High severity, with a CVSS score of 7.3, published 10 November 2026.

**Which products and versions are affected?** @microsoft/aspire-cli (npm) >= 13.4.2, < 13.6.5, SEMVER:introduced=13.4.2,fixed=13.6.5; @microsoft/aspire-cli-linux-arm64 (npm) >= 13.4.2, < 13.6.5, SEMVER:introduced=13.4.2,fixed=13.6.5; @microsoft/aspire-cli-linux-musl-x64 (npm) >= 13.4.2, < 13.6.5, SEMVER:introduced=13.4.2,fixed=13.6.5; @microsoft/aspire-cli-linux-x64 (npm) >= 13.4.2, < 13.6.5, SEMVER:introduced=13.4.2,fixed=13.6.5; and 8 more.

**Is there a fix for CVE-2026-120778?** Yes. @microsoft/aspire-cli (npm): upgrade to 13.6.5 or later; @microsoft/aspire-cli-linux-arm64 (npm): upgrade to 13.6.5 or later; @microsoft/aspire-cli-linux-musl-x64 (npm): upgrade to 13.6.5 or later; @microsoft/aspire-cli-linux-x64 (npm): upgrade to 13.6.5 or later; @microsoft/aspire-cli-osx-arm64 (npm): upgrade to 13.6.5 or later; @microsoft/aspire-cli-osx-x64 (npm): upgrade to 13.6.5 or later; Aspire.Cli (NuGet): upgrade to 13.6.5 or later; Aspire.Cli.linux-arm64 (NuGet): upgrade to 13.6.5 or later; Aspire.Cli.linux-musl-x64 (NuGet): upgrade to 13.6.5 or later; Aspire.Cli.linux-x64 (NuGet): upgrade to 13.6.5 or later; Aspire.Cli.osx-arm64 (NuGet): upgrade to 13.6.5 or later; Aspire.Cli.osx-x64 (NuGet): upgrade to 13.6.5 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-120778 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-120778?** Check whether you run Microsoft .NET Aspire, @microsoft/aspire-cli (npm), @microsoft/aspire-cli-linux-arm64 (npm) 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/aspire-cli (npm): upgrade to 13.6.5 or later

  ```sh
  npm install @microsoft/aspire-cli@13.6.5
  ```

- @microsoft/aspire-cli-linux-arm64 (npm): upgrade to 13.6.5 or later

  ```sh
  npm install @microsoft/aspire-cli-linux-arm64@13.6.5
  ```

- @microsoft/aspire-cli-linux-musl-x64 (npm): upgrade to 13.6.5 or later

  ```sh
  npm install @microsoft/aspire-cli-linux-musl-x64@13.6.5
  ```

- @microsoft/aspire-cli-linux-x64 (npm): upgrade to 13.6.5 or later

  ```sh
  npm install @microsoft/aspire-cli-linux-x64@13.6.5
  ```

- @microsoft/aspire-cli-osx-arm64 (npm): upgrade to 13.6.5 or later

  ```sh
  npm install @microsoft/aspire-cli-osx-arm64@13.6.5
  ```

- @microsoft/aspire-cli-osx-x64 (npm): upgrade to 13.6.5 or later

  ```sh
  npm install @microsoft/aspire-cli-osx-x64@13.6.5
  ```

- Aspire.Cli (NuGet): upgrade to 13.6.5 or later

  ```sh
  dotnet add package Aspire.Cli --version 13.6.5
  ```

- Aspire.Cli.linux-arm64 (NuGet): upgrade to 13.6.5 or later

  ```sh
  dotnet add package Aspire.Cli.linux-arm64 --version 13.6.5
  ```

- Aspire.Cli.linux-musl-x64 (NuGet): upgrade to 13.6.5 or later

  ```sh
  dotnet add package Aspire.Cli.linux-musl-x64 --version 13.6.5
  ```

- Aspire.Cli.linux-x64 (NuGet): upgrade to 13.6.5 or later

  ```sh
  dotnet add package Aspire.Cli.linux-x64 --version 13.6.5
  ```

- Aspire.Cli.osx-arm64 (NuGet): upgrade to 13.6.5 or later

  ```sh
  dotnet add package Aspire.Cli.osx-arm64 --version 13.6.5
  ```

- Aspire.Cli.osx-x64 (NuGet): upgrade to 13.6.5 or later

  ```sh
  dotnet add package Aspire.Cli.osx-x64 --version 13.6.5
  ```


## Technical details

The vulnerability is caused by creation of temporary files in a directory with insecure permissions in .NET Aspire. An authorized attacker with local access can exploit this to escalate privileges locally. The attack requires prior authorization and local access to the affected system.

## Affected products

- Microsoft .NET Aspire

## Identifiers

- CVE-2026-120778
- GHSA-m63f-xhvm-6mv5

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-120778](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-120778)

## Related threats

- [.NET Aspire information disclosure in log files](https://junglewise.ai/threats/duplicate-advisory-microsoft-security-advisory-aspire-information-c1e21083)
- [.NET Aspire privilege escalation in temporary file handling](https://junglewise.ai/threats/duplicate-advisory-microsoft-security-advisory-aspire-elevation-of-101ce3f2)
- [.NET Aspire sensitive information insertion in log file](https://junglewise.ai/threats/cve-2026-120792-insertion-of-sensitive-information-into-log-file-in-net-aspire)
- [.NET Aspire insertion of sensitive information into sent data](https://junglewise.ai/threats/cve-2026-120006-insertion-of-sensitive-information-into-sent-data-in-net-aspire)