Jakarta. Australian immigration authorities have accidentally disclosed personal details of world leaders attending last November's G-20 summit, including those of President Joko Widodo, The Guardian reported on Monday.

According to the report, an Australian immigration official sent "passport numbers, visa details and other personal identifiers of all world leaders attending the summit" to organizers of the AFC Asian Cup, an international football tournament held Down Under last January.

Besides Joko, world leaders whose data were disclosed include US President Barack Obama, Russian President Vladimir Putin, China's President Xi Jinping, Japan's Prime Minister Shinzo Abe, Indian PM Narendra Modi, German Chancellor Angela Merkel and British PM David Cameron.

The British newspaper also said that the leaders in question, or their governments, were not immediately informed of the breach.

"The Australian privacy commissioner was contacted by the director of the visa services division of Australia’s Department of Immigration and Border Protection to inform them of the data breach on 7 November 2014 and seek urgent advice," the Guardian writes, citing an e-mail obtained under freedom of information laws.

A total of 31 world leaders were on the list.

The paper quotes the e-mail as saying:

“The cause of the breach was human error. [Redacted] failed to check that the autofill function in Microsoft Outlook had entered the correct person’s details into the email ‘To’ field. This led to the email being sent to the wrong person. ... The matter was brought to my attention directly by [redacted] immediately after receiving an email from [the recipient] informing them that they had sent the email to the wrong person. ... The risk remains only to the extent of human error, but there was nothing systemic or institutional about the breach.”

The Asian Cup organizers were asked to delete the e-mail, which they apparently did, and the visa services division director recommended to not disclose the fact that information was inadvertently leaked.

“Given that the risks of the breach are considered very low and the actions that have been taken to limit the further distribution of the email, I do not consider it necessary to notify the clients of the breach,” The Guardian quotes the official as saying in the declassified e-mail.