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GHSA-x6fg-52vr-hj4w: NAT is a commonHandler any authenticated member can create, and newHTTPandGRPCMux matches r.Host against NAT before dispatching the dashboard/gRPC handlers, so a member could register the dashboard's own host as a NAT Domain and hijack global routing. Add IsReservedDashboardHost (InstallHost/ListenHost plus an operator-declared ReservedHosts list for reverse-proxy deployments), reject reserved hosts on create/update, and drop pre-planted records when building the startup cache. GHSA-39g2-8x68-pmx8: bind-time CheckPermission let a member pre-bind a DDNS profile ID that the victim would only create later. GetDDNSProvidersFromProfiles now re-validates ownership by server owner UID and skips foreign-owned profiles (UserID==0 is treated as a migration artifact, not an admin grant). Co-authored-by: cloudcode <cloudcode@users.noreply.github.com>