Tenable has published API reference guides for the Nessus and SecurityCenter 4 XMLRPC interfaces. We've also added a "Products APIs and Data Internals" topic area on the Tenable Discussion Forums. This area allows Tenable product users to ask questions about the APIs and share code.
The Nessus API allows users to interact with the Nessus scanner in an automated fashion. For example, scans can be created and reports can be downloaded. The Nessus App for iPhone as well as the flash interface in Nessus 4.2 all make use of the XMLRPC interface.
The SecurityCenter API allows enterprise users to receive vulnerability, patch, configuration, log, alert, event and much more. Sophisticated filters can be used to obtain vulnerability or log data for custom dashboards, reports and analytics. The API also allows for static asset lists to be uploaded for integration with a variety of asset inventory devices.
In addition to the XMLRPC interface APIs, the "Products APIs and Data Internals" topic area also serves as a focal point to discuss data internals of our products. For example, Nessus stylesheets can be used to customize reports. New stylesheets have been posted to this area with recommendations and feedback from Tenable engineers and customers.
Both APIs are available to customers on the Tenable Support Portal. The Nessus XMLRPC API is also available to the public on the Nessus documentation page.