diff --git a/providers/fab/src/airflow/providers/fab/www/app.py b/providers/fab/src/airflow/providers/fab/www/app.py
index f96451a62759d..3803adbde8d6c 100644
--- a/providers/fab/src/airflow/providers/fab/www/app.py
+++ b/providers/fab/src/airflow/providers/fab/www/app.py
@@ -56,6 +56,10 @@ def create_app(enable_plugins: bool):
     flask_app.secret_key = conf.get("webserver", "SECRET_KEY")
     flask_app.config["SQLALCHEMY_DATABASE_URI"] = conf.get("database", "SQL_ALCHEMY_CONN")
     flask_app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False
+    webserver_config = conf.get_mandatory_value("webserver", "config_file")
+    # Enable customizations in webserver_config.py to be applied via Flask.current_app.
+    with flask_app.app_context():
+        flask_app.config.from_pyfile(webserver_config, silent=True)
 
     url = make_url(flask_app.config["SQLALCHEMY_DATABASE_URI"])
     if url.drivername == "sqlite" and url.database and not isabs(url.database):