I am a Medibank customer. Am I affected by the cyber-attack? What can I do to protect myself?

If in the last seven years you were a Medibank or ahm customer, or were with Medibank as an international student, it’s likely your data was exposed. Photograph: Bianca de Marchi/AAP

Millions of Medibank’s current and former customers have had their personal information, including health claims, exposed in a hack of the company’s customer database.

Here’s what we know so far, and what you can do.