AspNetCore.Docs/aspnetcore/includes/connectionid-signalr.md

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---
no-loc: [appsettings.json, "ASP.NET Core Identity", cookie, Cookie, Blazor, "Blazor Server", "Blazor WebAssembly", "Identity", "Let's Encrypt", Razor, SignalR]
---
> [!WARNING]
> Security warning: Exposing `ConnectionId` can lead to malicious impersonation if the SignalR server or client version is ASP.NET Core 2.2 or earlier.