Hackers are attempting to sell what they claim are the bank account details of 30 million Santander customers for $2 million.

Earlier this month, Santander confirmed that a data breach at a third-party provider had exposed some client and employee data.

Now, in a post on a hacking forum, the ShinyHunters gang is offering to sell a trove of data, including 30 million bank account details, 28 million credit card numbers, six million account numbers and balances, and HR information on the bank's 200,000 staffers.

The asking price is $2 million, with the post adding, "Santander is also very welcome if they want to buy this data."

Earlier this week, the ShinyHunters hackers also claimed responsibility for an attack on TicketMaster. They have previously targeted telecom giant AT&T.

However, experts urge caution, suggesting that the TicketMaster sale may have been a stunt to draw attention to a new hacking forum replacing one that authorities had taken down, according to the BBC.

In a statement on the attack two weeks ago, Santander said a bank database hosted by a third party had been accessed. The breach affected operations in Spain, Chile, and Uruguay.

The bank added, "No transactional data, nor any credentials that would allow transactions to take place on accounts are contained in the database, including online banking details and passwords. The bank's operations and systems are not affected, so customers can continue to transact securely."

This incident highlights the ongoing challenges in securing sensitive data and the importance of robust cybersecurity measures.