Personal information belonging to millions of past and present AT&T customers has been leaked online, including Social Security numbers (SSNs), passcodes and contact details, the multinational company says.
In a statement on Saturday, the telecommunication network –
the largest in the United States – said a recently discovered dataset on the
“dark web” contained information for about 7.6 million current AT&T account
holders and 65.4 million former users, totalling about 73 million affected
accounts.
It is not known if the breach “originated from AT&T or
one of its vendors”, the company said.
“To the best of our knowledge, the compromised data appears
to be from 2019 or earlier and does not contain personal financial information
or call history,” the statement added.
All 7.6 million existing account holders whose sensitive
personal information was compromised were set to be notified about the breach
AT&T. The company said it had already reset passcodes and was investigating
the incident.
In addition to passcodes and SSNs, the hacked data possibly
included email and mailing addresses, phone numbers and birth dates, AT&T
added.
Reports of the breach first surfaced on a hacking forum
nearly two weeks ago. It is unclear if the leak is linked to a similar breach
in 2021 that was widely reported but that AT&T did not acknowledge.
A hacker at the time claimed to have access to data of 70
million AT&T customers, including their names, addresses, phone numbers,
SSNs, and date of birth.
Auction data on a hacking forum revealed the hacker
attempted to sell the stolen information for thousands of dollars.
“If they assess this and they made the wrong call on it, and
we’ve had a course of years pass without them being able to notify impacted
customers” then it’s likely the company will soon face class action lawsuits,
cybersecurity expert Troy Hunt told The Associated Press news agency.
Troy, the creator of Have I Been Pwned? – a website that
alerts subscribers to data breaches – said in a blogpost at least 153,000 of
his customers were affected.
The Dallas-based company faced challenges earlier in
February after an outage temporarily knocked out mobile phone service for
thousands of users.
AT&T blamed the incident on a technical coding error,
not a malicious attack. Other networks were also affected, but AT&T
appeared to be the hardest hit.
Seems like this information is something that should have wider dissemination as opposed to a blurb on the local news.🤦
— 3rdStrike (@GinniesDaughter) March 31, 2024