CVE-2026-70175: ASP.NET Core Elevation of Privilege Vulnerability

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-13 · updated 2026-10-31
Weakness: CWE-640

Description

Improper authentication in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.

Affected products

Microsoft ASP.NET Core 10.0: from 10.0 before 10.0.13 — fixed in 10.0.13
Microsoft ASP.NET Core 8.0: from 8.0 before 8.0.32 — fixed in 8.0.32
Microsoft ASP.NET Core 9.0: from 9.0 before 9.0.21 — fixed in 9.0.21
Microsoft Visual Studio 2026 version 18.10: from 18.10.0 before 18.10.4 — fixed in 18.10.4
Microsoft Visual Studio 2022 version 17.14: from 17.14.0 before 17.14.42 — fixed in 17.14.42

How to fix

Upgrade to a fixed version: Microsoft ASP.NET Core 10.0 10.0.13; Microsoft ASP.NET Core 8.0 8.0.32; Microsoft ASP.NET Core 9.0 9.0.21; Microsoft Visual Studio 2026 version 18.10 18.10.4; Microsoft Visual Studio 2022 version 17.14 17.14.42. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70175

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