ZoomEye finds 1,160,264 Mosquitto MQTT brokers exposed to the internet

A ZoomEye query for app="Mosquitto" run on 29 September 2026 returned 1,160,264 matches, meaning that many internet-reachable services were identified as the Mosquitto MQTT broker. A fingerprint match does not prove anonymous access, but an open listener lets any client subscribe to and publish on every topic the broker handles.

• ZoomEye query app="Mosquitto" on 29 September 2026 returned 1,160,264 matches
• Mosquitto is commonly embedded in home automation, sensor gateways and industrial systems
• Project guides often leave the listener on port 1883 with default settings
• With anonymous access, any client can subscribe to and publish on all topics