# CVE-2026-70175: Microsoft ASP.NET Core Identity weak password recovery in confirmation flow

Source: https://junglewise.ai/threats/cve-2026-70175-microsoft-security-advisory-asp-net-core-elevation-of-privilege  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-13. Updated: 2026-10-13  
License: CC BY 4.0 with a link back

CVE-2026-70175 · Severity: high · CVSS 8.1 · Published 2026-10-13

ASP.NET Core Identity, used to manage user authentication in web applications, has a flaw in its password reset and email confirmation flows. An attacker can intercept or manipulate the request to redirect password reset and confirmation emails to an attacker-controlled address instead of the user's legitimate email, potentially allowing account takeover.

Technologies: [Microsoft Asp.Net Core](https://junglewise.ai/threats/technologies/asp-net-core), [Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-app-runtime-linux-arm), [Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-app-runtime-linux-arm64), [Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-app-runtime-linux-musl-arm), [Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-app-runtime-linux-musl-arm64), [Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-app-runtime-linux-musl-x64), [Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-app-runtime-linux-x64), [Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-app-runtime-osx-arm64), [Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-app-runtime-osx-x64), [Microsoft.AspNetCore.App.Runtime.win-arm (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-app-runtime-win-arm), [Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-app-runtime-win-arm64), [Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-app-runtime-win-x64), [Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-app-runtime-win-x86). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft), [NuGet](https://junglewise.ai/threats/vendors/nuget).

## Quick answers

**Is CVE-2026-70175 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-70175 being exploited in the wild.

**How severe is CVE-2026-70175?** High severity, with a CVSS score of 8.1, published 13 October 2026.

**Which products and versions are affected?** Microsoft Asp.Net Core 8.0.0 through 8.0.31, 9.0.0 through 9.0.20, 10.0.0 through 10.0.12; Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet) >= 9.0.0, <= 9.0.20, ECOSYSTEM:introduced=9.0.0,fixed=9.0.21; Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet) >= 9.0.0, <= 9.0.20, ECOSYSTEM:introduced=9.0.0,fixed=9.0.21; Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet) >= 9.0.0, <= 9.0.20, ECOSYSTEM:introduced=9.0.0,fixed=9.0.21; and 9 more.

**Is there a fix for CVE-2026-70175?** Yes. Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): upgrade to 9.0.21 or later; Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): upgrade to 9.0.21 or later; Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet): upgrade to 9.0.21 or later; Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet): upgrade to 9.0.21 or later; Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet): upgrade to 9.0.21 or later; Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet): upgrade to 9.0.21 or later; Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet): upgrade to 9.0.21 or later; Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet): upgrade to 9.0.21 or later; Microsoft.AspNetCore.App.Runtime.win-arm (NuGet): upgrade to 9.0.21 or later; Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet): upgrade to 9.0.21 or later; Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet): upgrade to 9.0.21 or later; Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet): upgrade to 9.0.21 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-70175 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-70175?** Check whether you run Microsoft Asp.Net Core, Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet), Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet) or one of the others listed 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.

## How to fix

- Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): upgrade to 9.0.21 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.App.Runtime.linux-arm --version 9.0.21
  ```

- Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): upgrade to 9.0.21 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.App.Runtime.linux-arm64 --version 9.0.21
  ```

- Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet): upgrade to 9.0.21 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.App.Runtime.linux-musl-arm --version 9.0.21
  ```

- Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet): upgrade to 9.0.21 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 --version 9.0.21
  ```

- Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet): upgrade to 9.0.21 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.App.Runtime.linux-musl-x64 --version 9.0.21
  ```

- Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet): upgrade to 9.0.21 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.App.Runtime.linux-x64 --version 9.0.21
  ```

- Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet): upgrade to 9.0.21 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.App.Runtime.osx-arm64 --version 9.0.21
  ```

- Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet): upgrade to 9.0.21 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.App.Runtime.osx-x64 --version 9.0.21
  ```

- Microsoft.AspNetCore.App.Runtime.win-arm (NuGet): upgrade to 9.0.21 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.App.Runtime.win-arm --version 9.0.21
  ```

- Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet): upgrade to 9.0.21 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.App.Runtime.win-arm64 --version 9.0.21
  ```

- Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet): upgrade to 9.0.21 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.App.Runtime.win-x64 --version 9.0.21
  ```

- Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet): upgrade to 9.0.21 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.App.Runtime.win-x86 --version 9.0.21
  ```


## Technical details

The vulnerability exists in Microsoft.AspNetCore.Identity and Microsoft.AspNetCore.Identity.UI where password-reset and email-confirmation flows send emails to an unvalidated request address rather than the user's canonical stored email address. This allows attackers to redirect sensitive reset tokens and confirmation links to attacker-controlled mailboxes. An attacker with network access to exploit this weakness can bypass normal email-based account recovery safeguards and gain unauthorized access to user accounts.

## Affected products

- Microsoft ASP.NET Core 8.0.0 through 8.0.31, 9.0.0 through 9.0.20, 10.0.0 through 10.0.12

## Identifiers

- CVE-2026-70175
- GHSA-x3vp-85cm-q97r

## Timeline

- 2026-10-13: disclosed

## Related threats

- [Microsoft ASP.NET Core resource exhaustion denial of service](https://junglewise.ai/threats/cve-2026-109468-allocation-of-resources-without-limits-or-throttling-in-asp-net)
- [ASP.NET Core Kestrel denial of service in HTTP/3 handling](https://junglewise.ai/threats/cve-2026-70186-microsoft-security-advisory-asp-net-core-denial-of-service)
- [Microsoft ASP.NET Core Kestrel HTTP request smuggling in HTTP/2](https://junglewise.ai/threats/cve-2026-70188-microsoft-security-advisory-asp-net-core-security-feature-bypass)
- [Microsoft ASP.NET Core Localization denial of service](https://junglewise.ai/threats/cve-2026-96236-microsoft-security-advisory-asp-net-core-denial-of-service)
- [Microsoft ASP.NET Core authorization bypass in Blazor AuthorizeRouteView](https://junglewise.ai/threats/cve-2026-70183-microsoft-security-advisory-asp-net-core-security-feature-bypass)