The personal details of all 31 leaders at the recent G20 summit in Australia have been accidentally leaked by the Australian immigration department. Despite being notified of the high-profile breach four months ago, it neglected to inform anyone.

The details included passport numbers, visa details and other particulars of each leader at the summit.

In a letter obtained under Freedom of Information requests, it’s been revealed that a staffer at the G20 leaders summit staged in Australia last November mistakenly mailed a list of the leaders’ personal details to an official at the Asian Football Cup Local Organising Committee.

Although the information hasn’t been publicly exposed and is unlikely to be of use for nefarious purposes, not many people are likely to pretend to be Vladimir Putin or David Cameron. The damage is reputational and is certainly embarrassing for the Australian government. Ironically it had just recently passed controversial mandatory metadata retention laws.