MSAL.NET applications targeting Xamarin Android and .NET Android (MAUI) susceptible to local denial of service
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · Low · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-863.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| AzureAD | microsoft-authentication-library-for-dotnet | 4.48.0 to before 4.59.1; 4.60.0 to before 4.60.3 | 4.59.1, 4.60.3 | Patch available | CNA |
| — | Microsoft.Identity.Client (NuGet) | 4.48.0 to before 4.59.1 | 4.59.1 | Patch available | GHSA-x674-v45j-fwxw |
| — | Microsoft.Identity.Client (NuGet) | 4.60.0 to before 4.60.3 | 4.60.3 | Patch available | GHSA-x674-v45j-fwxw |
- microsoft-authentication-library-for-dotnet VendorAzureAD Affected 4.48.0 to before 4.59.1; 4.60.0 to before 4.60.3 Fixed in 4.59.1, 4.60.3 Patch available CNA
- Microsoft.Identity.Client (NuGet) Vendor— Affected 4.48.0 to before 4.59.1 Fixed in 4.59.1 Patch available GHSA-x674-v45j-fwxw
- Microsoft.Identity.Client (NuGet) Vendor— Affected 4.60.0 to before 4.60.3 Fixed in 4.60.3 Patch available GHSA-x674-v45j-fwxw
Remediation
- Fix · CNA microsoft-authentication-library-for-dotnet (AzureAD) Fixed in 4.59.1, 4.60.3
- Fix · GHSA-x674-v45j-fwxw Microsoft.Identity.Client (NuGet) Fixed in 4.59.1 Advisory →
- Fix · GHSA-x674-v45j-fwxw Microsoft.Identity.Client (NuGet) Fixed in 4.60.3 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2024-27086
- 2026-10-03 Alias added: GHSA-x674-v45j-fwxw
References
Other 5
- 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
- https://github.com/AzureAD/microsoft-authentication-library-for-dotnet
- https://learn.microsoft.com/en-us/entra/msal/dotnet
- https://www.nuget.org/packages/Microsoft.Identity.Client
More AzureAD vulnerabilities
- TI-2025-23140 Microsoft Identity Web Exposes Client Secrets and Certificate Information in Service Logs CVSS 3.1MEDIUM 4.7
Sources
- CVE-2024-27086 · CVE Program
- CVE-2024-27086 · NVD
- FIRST EPSS
- GHSA-x674-v45j-fwxw · GitHub Advisory Database · CC BY 4.0
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