diff --git a/packages/node_modules/@node-red/nodes/core/network/10-mqtt.js b/packages/node_modules/@node-red/nodes/core/network/10-mqtt.js
index 5d4efaf93..5546dc868 100644
--- a/packages/node_modules/@node-red/nodes/core/network/10-mqtt.js
+++ b/packages/node_modules/@node-red/nodes/core/network/10-mqtt.js
@@ -288,7 +288,7 @@ module.exports = function(RED) {
                         //TODO: delete msg.responseTopic - to prevent it being resent?
                     }
                 }
-                topicOK = topicOK && !/[\+#]/.test(msg.topic);
+                topicOK = topicOK && !/[\+#\b\f\n\r\t\v\0]/.test(msg.topic);
 
                 if (topicOK) {
                     node.brokerConn.publish(msg, done); // send the message
@@ -730,12 +730,18 @@ module.exports = function(RED) {
                     node.client.on("reconnect", function() {
                         setStatusConnecting(node, true);
                     });
-                    //TODO: what to do with this event? Anything? Necessary?
+                    //Broker Disconnect - V5 event
                     node.client.on("disconnect", function(packet) {
                         //Emitted after receiving disconnect packet from broker. MQTT 5.0 feature.
-                        var rc = packet && packet.properties && packet.properties.reasonString;
-                        var rc = packet && packet.properties && packet.reasonCode;
-                        //TODO: If keeping this event, do we use these? log these?
+                        const rc = (packet && packet.properties && packet.reasonCode) || packet.reasonCode;
+                        const rs = packet && packet.properties && packet.properties.reasonString || "";
+                        const details = {
+                            broker: (node.clientid?node.clientid+"@":"")+node.brokerurl,
+                            reasonCode: rc,
+                            reasonString: rs
+                        }
+                        node.log(RED._("mqtt.state.broker-disconnected", details));
+                        setStatusDisconnected(node, true);
                     });
                     // Register disconnect handlers
                     node.client.on('close', function () {
diff --git a/packages/node_modules/@node-red/nodes/locales/en-US/messages.json b/packages/node_modules/@node-red/nodes/locales/en-US/messages.json
index f66305abc..ecc5d905c 100755
--- a/packages/node_modules/@node-red/nodes/locales/en-US/messages.json
+++ b/packages/node_modules/@node-red/nodes/locales/en-US/messages.json
@@ -442,7 +442,8 @@
         "state": {
             "connected": "Connected to broker: __broker__",
             "disconnected": "Disconnected from broker: __broker__",
-            "connect-failed": "Connection failed to broker: __broker__"
+            "connect-failed": "Connection failed to broker: __broker__",
+            "broker-disconnected": "Broker __broker__ disconnected client: __reasonCode__ __reasonString__"
         },
         "retain": "Retain",
         "output": {