Too early to tell for sure, but it looks like the current theory is that it’s some combination of aggregating existing breach data and information gleaned from credential stuffing attacks.

It’s more plausible than some absurd number of websites all had the same 0-day leading to 26,000,000,000 accounts leaked. The people selling these aren’t exactly trustworthy and are just as likely to repackage old leaks to rip each other off with.

This is the best summary I could come up with:

Bob Dyachenko, owner of SecurityDiscovery.com and researchers from Cybernews discovered the data breach on an unsecured web instance.

The researchers said: ‘The dataset is extremely dangerous as threat actors could leverage the aggregated data for a wide range of attacks.’

They say that these attacks could include identity theft, sophisticated phishing schemes, targeted cyberattacks, and unauthorized access to personal and sensitive accounts.

Jake Moore, global cybersecurity advisor for ESET told MailOnline: 'This is an absolutely huge breach of data.

Simply enter your email address or phone number into the search bar and click ‘check now’ to see whether that account information has been leaked.

‘Apart from that, users whose data has been included in supermassive MOAB may become victims of spear-phishing attacks or receive high levels of spam emails.’

The original article contains 783 words, the summary contains 129 words. Saved 84%. I’m a bot and I’m open source!

Of the companies listed on the screenshot or mentioned in the article, at least LinkedIn, Twitter, Deezer, Dropbox, Zynga and MyFitnessPal have been hacked before. Probably just a collection of old data?

Edit: Yeah, aggregated data

Is CyberNews’ data checker safe? Or is entering an email just confirming a valid email address to the breachers?

Super old news at this poont and it’s already outdated. It’s just an aggregation with some fake data sprinkled in between.

I wouldn’t trust the Daily Mail as far as I can throw it. It’s objectively the lowest quality, least factually correct, most sensationalist, and most extremely biased mainstream newspaper we have in the UK. Essentially the British equivalent of Fox News.

Daily Fail regurgitating old hat again. For anyone interested in more actual details, here’s Troy Hunt with a written analysis and now also a follow-up on what he speculated after the first announcement by Cybernews; a re-leak of known data