FOSSBilling is a free, open-source billing and client management system. Versions 0.5.3 through 0.7.2 allow authenticated clients to both read and reset API key service secrets for orders that are no longer in an "active" state (e.g., "suspended", "canceled"). The root cause is missing order-state validation in two client API endpoints, despite an "isActive()" helper already existing in the "Serviceapikey" module and the frontend UI correctly gating access on "order.status == 'active'". Version 0.8.0 contains a fix. Some workarounds are available. If the "Serviceapikey" module is not needed, uninstall it to remove the affected endpoints. One may also use a reverse proxy or WAF to restrict access to "/api/client/order/service" and "/api/client/serviceapikey/reset" based on application-level order-state logic.