7

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2025-24070

CVE-2025-24070: Microsoft Security Advisory CVE-2025-24070: .NET Elevation of Privilege Vulnerability

Microsoft Security Advisory CVE-2025-24070: .NET Elevation of Privilege Vulnerability

<a name="executive-summary"></a>Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core 9.0 , ASP.NET Core 8.0, and ASP.NET Core 2.3. This advisory also provides guidance on what developers can do to update their applications to address this vulnerability.

A vulnerability exists in ASP.NET Core applications calling RefreshSignInAsync with an improperly authenticated user parameter that could allow an attacker to sign into another user's account, resulting in Elevation of Privilege.

Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/348

<a name="mitigation-factors"></a>Mitigation factors

Microsoft has not identified any mitigating factors for this vulnerability.

<a name="affected-software"></a>Affected software

Any ASP.NET Core 9.0 application running on ASP.NET Core 9.0.2 or earlier.
Any ASP.NET Core application running on ASP.NET Core 8.0.13 or earlier.
Any ASP.NET Core 2.x application consuming the package Microsoft.AspNetCore.Identity version 2.3.0 or earlier.

<a name="affected-packages"></a>Affected Packages

The vulnerability affects any Microsoft .NET Core project if it uses any of affected packages versions listed below

Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Identity | 2.3.0 | 2.3.1

<a name="ASP.NET Core 9"></a>ASP.NET Core 9

Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.App.Runtime.linux-arm | >= 9.0.0, <= 9.0.2 | 9.0.3 Microsoft.AspNetCore.App.Runtime.linux-arm64 | >= 9.0.0, <= 9.0.2 | 9.0.3 | >= 9.0.0, <= 9.0.2 | 9.0.3 | >= 9.0.0, <= 9.0.2 | 9.0.3 | >= 9.0.0, <= 9.0.2 | 9.0.3 | >= 9.0.0, <= 9.0.2 | 9.0.3 | >= 9.0.0, <= 9.0.2 | 9.0.3 | >= 9.0.0, <= 9.0.2 | 9.0.3 | >= 9.0.0, <= 9.0.2 | 9.0.3 | >= 9.0.0, <= 9.0.2 | 9.0.3 | >= 9.0.0, <= 9.0.2 | 9.0.3 | >= 9.0.0, <= 9.0.2 | 9.0.3

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CVE-2025-24070

CVE-2025-24070:

7

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
Microsoft.AspNetCore.Identity	nuget	= 2.3.0	2.3.1
Microsoft.AspNetCore.App.Runtime.linux-arm	nuget	>= 9.0.0, <= 9.0.2	9.0.3
Microsoft.AspNetCore.App.Runtime.linux-arm	nuget	>= 8.0.0, <= 8.0.13	8.0.14
Microsoft.AspNetCore.App.Runtime.linux-arm64	nuget	>= 9.0.0, <= 9.0.2	9.0.3
Microsoft.AspNetCore.App.Runtime.linux-arm64	nuget	>= 8.0.0, <= 8.0.13	8.0.14
Microsoft.AspNetCore.App.Runtime.linux-musl-arm	nuget	>= 9.0.0, <= 9.0.2	9.0.3
Microsoft.AspNetCore.App.Runtime.linux-musl-arm	nuget	>= 8.0.0, <= 8.0.13	8.0.14
Microsoft.AspNetCore.App.Runtime.linux-musl-arm64	nuget	>= 9.0.0, <= 9.0.2	9.0.3
Microsoft.AspNetCore.App.Runtime.linux-musl-arm64	nuget	>= 8.0.0, <= 8.0.13	8.0.14
Microsoft.AspNetCore.App.Runtime.linux-musl-x64	nuget	>= 9.0.0, <= 9.0.2	9.0.3
Microsoft.AspNetCore.App.Runtime.linux-musl-x64	nuget	>= 8.0.0, <= 8.0.13	8.0.14
Microsoft.AspNetCore.App.Runtime.linux-x64	nuget	>= 9.0.0, <= 9.0.2	9.0.3
Microsoft.AspNetCore.App.Runtime.linux-x64	nuget	>= 8.0.0, <= 8.0.13	8.0.14
Microsoft.AspNetCore.App.Runtime.osx-arm64	nuget	>= 9.0.0, <= 9.0.2	9.0.3
Microsoft.AspNetCore.App.Runtime.osx-arm64	nuget	>= 8.0.0, <= 8.0.13	8.0.14
Microsoft.AspNetCore.App.Runtime.osx-x64	nuget	>= 9.0.0, <= 9.0.2	9.0.3
Microsoft.AspNetCore.App.Runtime.osx-x64	nuget	>= 8.0.0, <= 8.0.13	8.0.14
Microsoft.AspNetCore.App.Runtime.win-arm	nuget	>= 8.0.0, <= 8.0.13	8.0.14
Microsoft.AspNetCore.App.Runtime.win-arm	nuget	>= 9.0.0, <= 9.0.2	9.0.3
Microsoft.AspNetCore.App.Runtime.win-arm64	nuget	>= 9.0.0, <= 9.0.2	9.0.3
Microsoft.AspNetCore.App.Runtime.win-arm64	nuget	>= 8.0.0, <= 8.0.13	8.0.14
Microsoft.AspNetCore.App.Runtime.win-x64	nuget	>= 9.0.0, <= 9.0.2	9.0.3
Microsoft.AspNetCore.App.Runtime.win-x64	nuget	>= 8.0.0, <= 8.0.13	8.0.14
Microsoft.AspNetCore.App.Runtime.win-x86	nuget	>= 8.0.0, <= 8.0.13	8.0.14
Microsoft.AspNetCore.App.Runtime.win-x86	nuget	>= 9.0.0, <= 9.0.2	9.0.3

Technical Details

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Root Cause Analysis

The advisory specifically mentions the vulnerability occurs when calling RefreshSignInAsync with an improperly authenticated user parameter. This method is part of ASP.NET Core's Identity system (SignInManager class) responsible for managing user authentication. The vulnerability stems from insufficient validation of the user parameter's authentication state before refreshing the session, enabling session hijacking. The high confidence comes from the direct correlation between the advisory's description and the SignInManager's RefreshSignInAsync method being the primary authentication refresh mechanism in ASP.NET Core Identity.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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7

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Basic Information

Basic Information

Concerned about an active attack path?

CVE-2025-24070: Microsoft Security Advisory CVE-2025-24070: .NET Elevation of Privilege Vulnerability

Microsoft Security Advisory CVE-2025-24070: .NET Elevation of Privilege Vulnerability

<a name="executive-summary"></a>Executive summary

Announcement

<a name="mitigation-factors"></a>Mitigation factors

<a name="affected-software"></a>Affected software

<a name="affected-packages"></a>Affected Packages

<a name="ASP.NET Core 9"></a>ASP.NET Core 9

CVE-2025-24070:

7

-

Basic Information

Basic Information

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Technical Details

Technical Details

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Vulnerable functions

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WAF Protection Rules

WAF Rule

Reasoning

Basic Information

Basic Information

Technical Details

7

7

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

CVE-2025-24070: Microsoft Security Advisory CVE-2025-24070: .NET Elevation of Privilege Vulnerability

Microsoft Security Advisory CVE-2025-24070: .NET Elevation of Privilege Vulnerability

<a name="executive-summary"></a>Executive summary

Announcement

<a name="mitigation-factors"></a>Mitigation factors

<a name="affected-software"></a>Affected software

<a name="affected-packages"></a>Affected Packages

<a name="ASP.NET Core 9"></a>ASP.NET Core 9

<a name="ASP.NET Core 8"></a>ASP.NET Core 8

Advisory FAQ

<a name="how-affected"></a>How do I know if I am affected?

<a name="how-fix"></a>How do I fix the issue?

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External Links

Acknowledgement

Revisions

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