Vulnerability GHSA-m63f-xhvm-6mv5

High Risk

8 hours ago

Microsoft Security Advisory CVE-2026-120778 - Aspire Elevation of Privilege Vulnerability

>=13.4.2 <13.6.5

Summary

Microsoft Security Advisory CVE-2026-120778 - Aspire Elevation of Privilege Vulnerability

Details

Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in the Aspire CLI. This advisory provides guidance on updating affected applications and components.

An insecure temporary directory used by Aspire CLI-generated builds can allow a local attacker to influence MSBuild response-file discovery and execute code with the privileges of the developer running the CLI.

Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/519

CVSS Details

Version: 3.1
Severity: High
Score: 7.3
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-379 (Creation of Temporary File in Directory with Insecure Permissions)
MSRC severity: Important

Affected Platforms

Platforms: Linux, macOS
Architectures: x64, Arm64

Affected Packages

Standalone Aspire CLI

Package	Affected version	Patched version
Aspire.Cli	>= 13.2.0, < 13.6.5	13.6.5
Aspire.Cli.linux-x64	>= 13.3.0, < 13.6.5	13.6.5
Aspire.Cli.linux-arm64	>= 13.3.0, < 13.6.5	13.6.5
Aspire.Cli.linux-musl-x64	>= 13.3.0, < 13.6.5	13.6.5
Aspire.Cli.osx-x64	>= 13.3.0, < 13.6.5	13.6.5
Aspire.Cli.osx-arm64	>= 13.3.0, < 13.6.5	13.6.5

Aspire CLI npm packages

Package	Affected version	Patched version
@microsoft/aspire-cli	>= 13.4.2, < 13.6.5	13.6.5
@microsoft/aspire-cli-linux-x64	>= 13.4.2, < 13.6.5	13.6.5
@microsoft/aspire-cli-linux-arm64	>= 13.4.2, < 13.6.5	13.6.5
@microsoft/aspire-cli-linux-musl-x64	>= 13.4.2, < 13.6.5	13.6.5
@microsoft/aspire-cli-osx-x64	>= 13.4.2, < 13.6.5	13.6.5
@microsoft/aspire-cli-osx-arm64	>= 13.4.2, < 13.6.5	13.6.5

The affected scenario concerns CLI-generated server and integration builds on non-Windows systems when a local attacker can influence automatic MSBuild response-file discovery through an attacker-writable directory. This includes builds started by aspire sdk generate, aspire sdk dump, and aspire sdk export.

Advisory FAQ

How do I know if I am affected?

The reported scenario involves a local attacker influencing a generated build through a shared temporary-directory ancestor while another user invokes the Aspire CLI. Versions 13.2.0 through 13.6.4 are affected.

Aspire ships independently of .NET. Installing a .NET runtime or SDK update does not establish that the affected Aspire CLI has been updated.

How do I fix the issue?

Update the Aspire CLI to version 13.6.5 or later. If installed as a .NET tool, update the Aspire.Cli package. If installed using npm, update @microsoft/aspire-cli to version 13.6.5 or later; its platform-specific dependency must also resolve to version 13.6.5 or later. Otherwise update the CLI through its installation method.

Other Information

Reporting Security Issues

If you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ.

Security reports made through MSRC may qualify for the Microsoft .NET 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 in the Aspire repository.

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.