.NET Aspire privilege escalation in temporary file handling

Severity: high · CVSS 7.3 · Published 2026-11-10

.NET Aspire is a framework for building cloud-native applications. An attacker with local access can exploit insecure temporary file permissions to escalate privileges and gain full control of a system, potentially accessing sensitive data or disrupting services.

Technologies: Aspire.Cli (NuGet). Vendors: Microsoft, 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?
High severity, with a CVSS score of 7.3, published 10 November 2026.
Which products and versions are affected?
Microsoft Aspire.Cli >= 13.2.0, < 13.6.5; Aspire.Cli (NuGet) >= 13.2.0, < 13.6.5, ECOSYSTEM:introduced=13.2.0.
Is there a fix for This vulnerability?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is This vulnerability attacked?
It is attacked with local access, in a software library.
Am I affected?
Check whether you run Microsoft Aspire.Cli or Aspire.Cli (NuGet) 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.

Technical details

CWE-379: temporary files created by .NET Aspire use insecure directory permissions, allowing a local authorized attacker to read or modify them. The vulnerability requires local access and user interaction. Successful exploitation grants confidentiality, integrity, and availability impacts on the affected system. No patched version is available from the advisory.

Affected products

  • Microsoft Aspire.Cli >= 13.2.0, < 13.6.5

Timeline

  • 2026-11-10: disclosed
  • 2026-11-10: advisory

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