Yahoo data breach affects at least 500 million users

Yahoo is blaming the breach on 'state-sponsored' hackers.

A massive breach at Yahoo compromised account details from at least 500 million users, and the company is blaming the attack on state-sponsored hackers.

Names, email addresses, telephone numbers, and hashed passwords may have been stolen as part of the hack, which occurred in late 2014, Yahoo said.

The company reported the breach on Thursday, after a stolen database from the company went on sale on the black market last month.

However, the hacker behind the sale claimed that the stolen database involved only 200 million users and was likely obtained in 2012.

It's unclear if Thursday's breach is connected. But Yahoo has been notifying affected users and asking them to change their passwords.

"We are recommending that all users who haven’t changed their passwords since 2014 do so," the company said in a statement. It's also asking that users review any suspicious activity related to their accounts.

The vast majority of the stolen passwords were hashed with the security tool bcrypt, making them more difficult to crack, Yahoo said.

But some security questions and answers from the accounts may have also been taken.

However, Yahoo's investigation suggests that no payment card data or banking details were stolen in the breach, the company added.

Yahoo has found no evidence showing that the hackers are still inside its network.

Yahoo has published an FAQ for affected users. The company is also working with law enforcement to investigate the incident.

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.

Tags Yahoodata breaches

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Michael Kan

IDG News Service
Show Comments

Brand Post

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Jack Jeffries

MSI GS75

As the Maserati or BMW of laptops, it would fit perfectly in the hands of a professional needing firepower under the hood, sophistication and class on the surface, and gaming prowess (sports mode if you will) in between.

Taylor Carr

MSI PS63

The MSI PS63 is an amazing laptop and I would definitely consider buying one in the future.

Christopher Low

Brother RJ-4230B

This small mobile printer is exactly what I need for invoicing and other jobs such as sending fellow tradesman details or step-by-step instructions that I can easily print off from my phone or the Web.

Aysha Strobbe

Microsoft Office 365/HP Spectre x360

Microsoft Office continues to make a student’s life that little bit easier by offering reliable, easy to use, time-saving functionality, while continuing to develop new features that further enhance what is already a formidable collection of applications

Michael Hargreaves

Microsoft Office 365/Dell XPS 15 2-in-1

I’d recommend a Dell XPS 15 2-in-1 and the new Windows 10 to anyone who needs to get serious work done (before you kick back on your couch with your favourite Netflix show.)

Maryellen Rose George

Brother PT-P750W

It’s useful for office tasks as well as pragmatic labelling of equipment and storage – just don’t get too excited and label everything in sight!

Featured Content

Product Launch Showcase

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?