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Vodafone has secured the security breach that allowed anyone with a bit of time on their hands to collect subscribers' email addresses and phone numbers.

The hole came to light on Wednesday and allowed anyone to enter a phone number and get the corresponding email address, or enter a valid user name to get both the email and phone number of that user. As word spread about the flaw and customers started getting emails from strangers who knew their phone numbers, Vodafone spent the last couple of days scrabbling to fix the problem.

The flaw isn't new, but hadn't been noticed until now. When a user forgets their password Vodafone asks for their phone number and sends an email to the corresponding address with a reminder. The problem was that the site also confirmed to whom the email had been sent, displaying the subscriber's email address. Users quickly discovered the same thing could be achieved by guessing a login name, in which case both the phone number and email address could be collected.

But now that's been fixed, so customers who forget their password will still get sent a reminder but will have to take it on faith that Vodafone has sent the message to the right place.

"We have sent an email to your registered email address," Voda says. "When you get it, click on the link. This will take you to a page where you can reset your password and view your username." We tried it this morning and have yet to receive the corresponding email, so some work is obviously ongoing, but at least it didn't display our email address to the world.

Quite how many email addresses were compromised in the 48 hours Vodafone spent fixing the problem we don't know. The operator has been busy reassuring customers, explaining: "The personal data stored on their My Account profile has not been directly at risk as a result of the site's functionality."

This is true, but the customer's email address and phone number might well have been compromised and that might matter to them. ®

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