diff --git a/app/Http/Controllers/Application/MqttAuthController.php b/app/Http/Controllers/Application/MqttAuthController.php
index e63722a..2a369ae 100644
--- a/app/Http/Controllers/Application/MqttAuthController.php
+++ b/app/Http/Controllers/Application/MqttAuthController.php
@@ -75,6 +75,10 @@ public function authorization(Request $request)
         $username = $request->input('username');
         $topic = $request->input('topic');
 
+        if ($topic === '#') {
+            return $this->deny();
+        }
+
         // 使用 / 分割 topic
         $topics = explode('/', $topic);