CVE-2026-70183: Microsoft Security Advisory CVE-2026-70183 - ASP.NET Core Security Feature Bypass Vulnerability

October 13, 2026 (updated October 19, 2026)

Microsoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Components.Authorization. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

A stale asynchronous authorization result in Blazor AuthorizeRouteView can be applied after navigation or an authorization-state change, bypassing the current [Authorize] decision.

References

Code Behaviors & Features

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