IT gaffes don't come much bigger than this. UK newsagent WHSmith has accidentally leaked a wealth of customer information by mass-emailing details that were submitted through a "contact us" form. The affected page is supposed to send customer messages and their contact details directly to WHSmith -- instead, they were reportedly sent to everyone on its mailing list. It's a huge technical blunder, and to make matters worse, some subscribers used the form when they first received the emails, thereby putting their own details into circulation. WHSmith confirmed to the Guardian that the problem was "a bug, not a data breach" and that it was caused by I-subscribe, an external company that manages its magazine subscriptions: "I-subscribe have immediately taken down their 'Contact Us' online form which contains the identified bug, while this is resolved."