diff --git a/gateway/platforms/webhook.py b/gateway/platforms/webhook.py
index 115b22d196f..93017de4e2b 100644
--- a/gateway/platforms/webhook.py
+++ b/gateway/platforms/webhook.py
@@ -326,6 +326,17 @@ class WebhookAdapter(BasePlatformAdapter):
                         _INSECURE_NO_AUTH,
                     )
                     continue
+                if (
+                    effective_secret == _INSECURE_NO_AUTH
+                    and not _is_loopback_host(self._host)
+                ):
+                    logger.warning(
+                        "[webhook] Dynamic route '%s' skipped: INSECURE_NO_AUTH "
+                        "is only allowed on loopback hosts. Current host: '%s'.",
+                        k,
+                        self._host,
+                    )
+                    continue
                 new_dynamic[k] = v
             self._dynamic_routes = new_dynamic
             self._routes = {**self._dynamic_routes, **self._static_routes}
diff --git a/tests/gateway/test_webhook_dynamic_routes.py b/tests/gateway/test_webhook_dynamic_routes.py
index c185a6eb15e..98c0db26492 100644
--- a/tests/gateway/test_webhook_dynamic_routes.py
+++ b/tests/gateway/test_webhook_dynamic_routes.py
@@ -138,10 +138,20 @@ class TestDynamicRouteSecretValidation:
         (tmp_path / _DYNAMIC_ROUTES_FILENAME).write_text(
             json.dumps({"test": {"secret": _INSECURE_NO_AUTH, "prompt": "p"}})
         )
-        adapter = _make_adapter()
+        adapter = _make_adapter(extra={"host": "127.0.0.1"})
         adapter._reload_dynamic_routes()
         assert "test" in adapter._routes
 
+    def test_insecure_no_auth_rejected_on_non_loopback_bind(self, tmp_path):
+        # Dynamic INSECURE_NO_AUTH routes are only valid on loopback hosts.
+        (tmp_path / _DYNAMIC_ROUTES_FILENAME).write_text(
+            json.dumps({"pub": {"secret": _INSECURE_NO_AUTH, "prompt": "p"}})
+        )
+        adapter = _make_adapter(extra={"host": "0.0.0.0"})
+        adapter._reload_dynamic_routes()
+        assert "pub" not in adapter._routes
+        assert "pub" not in adapter._dynamic_routes
+
     def test_warning_logged_on_skip(self, tmp_path, caplog):
         import logging
         (tmp_path / _DYNAMIC_ROUTES_FILENAME).write_text(