diff --git a/homeassistant/components/mqtt/device_tracker.py b/homeassistant/components/mqtt/device_tracker.py
index 87adde14d03..9a10170641e 100644
--- a/homeassistant/components/mqtt/device_tracker.py
+++ b/homeassistant/components/mqtt/device_tracker.py
@@ -28,7 +28,12 @@ from homeassistant.helpers.typing import ConfigType, VolSchemaType
 
 from . import subscription
 from .config import MQTT_BASE_SCHEMA
-from .const import CONF_JSON_ATTRS_TOPIC, CONF_PAYLOAD_RESET, CONF_STATE_TOPIC
+from .const import (
+    CONF_JSON_ATTRS_TEMPLATE,
+    CONF_JSON_ATTRS_TOPIC,
+    CONF_PAYLOAD_RESET,
+    CONF_STATE_TOPIC,
+)
 from .entity import MqttEntity, async_setup_entity_entry_helper
 from .models import MqttValueTemplate, ReceiveMessage
 from .schemas import MQTT_ENTITY_COMMON_SCHEMA
@@ -151,16 +156,54 @@ class MqttDeviceTracker(MqttEntity, TrackerEntity):
         self, extra_state_attributes: dict[str, Any]
     ) -> None:
         """Extract the location from the extra state attributes."""
-        self._attr_latitude = extra_state_attributes.get(ATTR_LATITUDE)
-        self._attr_longitude = extra_state_attributes.get(ATTR_LONGITUDE)
         if (
             ATTR_LATITUDE in extra_state_attributes
             or ATTR_LONGITUDE in extra_state_attributes
         ):
-            # Reset manual set location
+            latitude: float | None
+            longitude: float | None
+            gps_accuracy: int
+            # Reset manually set location to allow automatic zone detection
             self._attr_location_name = None
+            if isinstance(
+                latitude := extra_state_attributes.get(ATTR_LATITUDE), (int, float)
+            ) and isinstance(
+                longitude := extra_state_attributes.get(ATTR_LONGITUDE), (int, float)
+            ):
+                self._attr_latitude = latitude
+                self._attr_longitude = longitude
+            else:
+                # Invalid or incomplete coordinates, reset location
+                self._attr_latitude = None
+                self._attr_longitude = None
+                _LOGGER.warning(
+                    "Extra state attributes received at % and template %s "
+                    "contain invalid or incomplete location info. Got %s",
+                    self._config.get(CONF_JSON_ATTRS_TEMPLATE),
+                    self._config.get(CONF_JSON_ATTRS_TOPIC),
+                    extra_state_attributes,
+                )
+
+            if ATTR_GPS_ACCURACY in extra_state_attributes:
+                if isinstance(
+                    gps_accuracy := extra_state_attributes[ATTR_GPS_ACCURACY],
+                    (int, float),
+                ):
+                    self._attr_location_accuracy = gps_accuracy
+                else:
+                    _LOGGER.warning(
+                        "Extra state attributes received at % and template %s "
+                        "contain invalid GPS accuracy setting, "
+                        "gps_accuracy was set to 0 as the default. Got %s",
+                        self._config.get(CONF_JSON_ATTRS_TEMPLATE),
+                        self._config.get(CONF_JSON_ATTRS_TOPIC),
+                        extra_state_attributes,
+                    )
+                    self._attr_location_accuracy = 0
+
+            else:
+                self._attr_location_accuracy = 0
 
-        self._attr_location_accuracy = extra_state_attributes.get(ATTR_GPS_ACCURACY, 0)
         self._attr_extra_state_attributes = {
             attribute: value
             for attribute, value in extra_state_attributes.items()
diff --git a/tests/components/mqtt/test_device_tracker.py b/tests/components/mqtt/test_device_tracker.py
index c2b2ea73a4d..cd87ce9717a 100644
--- a/tests/components/mqtt/test_device_tracker.py
+++ b/tests/components/mqtt/test_device_tracker.py
@@ -450,14 +450,82 @@ async def test_setting_device_tracker_location_via_lat_lon_message(
     assert state.attributes["latitude"] == 50.1
     assert state.attributes["longitude"] == -2.1
     assert state.attributes["gps_accuracy"] == 0
+    assert state.attributes["source_type"] == "gps"
     assert state.state == STATE_NOT_HOME
 
+    # incomplete coordinates results in unknown state
     async_fire_mqtt_message(hass, "attributes-topic", '{"longitude": -117.22743}')
     state = hass.states.get("device_tracker.test")
+    assert "latitude" not in state.attributes
+    assert "longitude" not in state.attributes
+    assert state.attributes["source_type"] == "gps"
     assert state.state == STATE_UNKNOWN
 
     async_fire_mqtt_message(hass, "attributes-topic", '{"latitude":32.87336}')
     state = hass.states.get("device_tracker.test")
+    assert "latitude" not in state.attributes
+    assert "longitude" not in state.attributes
+    assert state.attributes["source_type"] == "gps"
+    assert state.state == STATE_UNKNOWN
+
+    # invalid coordinates results in unknown state
+    async_fire_mqtt_message(
+        hass, "attributes-topic", '{"longitude": -117.22743, "latitude":null}'
+    )
+    state = hass.states.get("device_tracker.test")
+    assert "latitude" not in state.attributes
+    assert "longitude" not in state.attributes
+    assert state.attributes["source_type"] == "gps"
+    assert state.state == STATE_UNKNOWN
+
+    # Test number validation
+    async_fire_mqtt_message(
+        hass,
+        "attributes-topic",
+        '{"latitude": "32.87336","longitude": "-117.22743", "gps_accuracy": "1.5", "source_type": "router"}',
+    )
+    state = hass.states.get("device_tracker.test")
+    assert "latitude" not in state.attributes
+    assert "longitude" not in state.attributes
+    assert "gps_accuracy" not in state.attributes
+    # assert source_type is overridden by discovery
+    assert state.attributes["source_type"] == "router"
+    assert state.state == STATE_UNKNOWN
+
+    # Test with invalid GPS accuracy should default to 0,
+    # but location updates as expected
+    async_fire_mqtt_message(
+        hass,
+        "attributes-topic",
+        '{"latitude": 32.871234,"longitude": -117.21234, "gps_accuracy": "invalid", "source_type": "router"}',
+    )
+    state = hass.states.get("device_tracker.test")
+    assert state.state == STATE_NOT_HOME
+    assert state.attributes["latitude"] == 32.871234
+    assert state.attributes["longitude"] == -117.21234
+    assert state.attributes["gps_accuracy"] == 0
+    assert state.attributes["source_type"] == "router"
+
+    # Test with invalid latitude
+    async_fire_mqtt_message(
+        hass,
+        "attributes-topic",
+        '{"latitude": null,"longitude": "-117.22743", "gps_accuracy": 1, "source_type": "router"}',
+    )
+    state = hass.states.get("device_tracker.test")
+    assert "latitude" not in state.attributes
+    assert "longitude" not in state.attributes
+    assert state.state == STATE_UNKNOWN
+
+    # Test with invalid longitude
+    async_fire_mqtt_message(
+        hass,
+        "attributes-topic",
+        '{"latitude": 32.87336,"longitude": "unknown", "gps_accuracy": 1, "source_type": "router"}',
+    )
+    state = hass.states.get("device_tracker.test")
+    assert "latitude" not in state.attributes
+    assert "longitude" not in state.attributes
     assert state.state == STATE_UNKNOWN