Apache Airflow's secrets masker did not mask "var.json" Variable values whose value is a dict in the Rendered Templates UI — the dict value failed an "isinstance(str)" guard — so a secret stored as a JSON Variable and referenced in a template via "var.json" was displayed in cleartext to any user with access to that task's Rendered Templates view. Users are advised to upgrade to apache-airflow 3.3.1 or later, which masks nested Variable values regardless of type.