diff --git a/esphome/components/web_server_base/web_server_base.h b/esphome/components/web_server_base/web_server_base.h
index bc37337ca5..cdabe66d44 100644
--- a/esphome/components/web_server_base/web_server_base.h
+++ b/esphome/components/web_server_base/web_server_base.h
@@ -81,6 +81,7 @@ class WebServerBase : public Component {
       return;
     }
     this->server_ = std::make_shared<AsyncWebServer>(this->port_);
+    DefaultHeaders::Instance().addHeader("Access-Control-Allow-Origin", "*");
     this->server_->begin();
 
     for (auto *handler : this->handlers_)