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, = 9.0.0, = 9.0.0, <= 9.0.20, ECOSYSTEM:introduced=9.0.0,fixed=9.0.21; and 9 more.

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.

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

Q: 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.

Q: How is CVE-2026-70175 attacked?

It is attacked over the network, in a software library.

Q: 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.

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.

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

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

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

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

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

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

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

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

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

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

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

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

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

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