diff --git a/pkg/cmd/proxy/proxy.go b/pkg/cmd/proxy/proxy.go
index 02b7f409d..64d194906 100644
--- a/pkg/cmd/proxy/proxy.go
+++ b/pkg/cmd/proxy/proxy.go
@@ -178,6 +178,9 @@ func (o *ProxyOptions) Complete(f cmdutil.Factory) error {
 		}
 		o.filter = nil
 	} else {
+		if o.rejectPaths == "" || o.rejectMethods == "" {
+			klog.Warning("Request filter has been relaxed, your proxy may be vulnerable to attacks, please be cautious")
+		}
 		o.filter = &proxy.FilterServer{
 			AcceptPaths:   proxy.MakeRegexpArrayOrDie(o.acceptPaths),
 			RejectPaths:   proxy.MakeRegexpArrayOrDie(o.rejectPaths),