More than 32.8 million Twitter credentials have been compromised and are being offered for sale on the dark web, claims LeakedSource, a subscription-based breach notification service.

But some security experts question whether the credentials are current and authentic.

Cost: 32.8 credentials

Read more here

In one of the biggest data breaches ever, a hacker gained access to more than 100 million Capital One customers' accounts and credit card applications earlier this year.

Paige Thompson is accused of breaking into a Capital One server and gaining access to 140,000 Social Security numbers, 1 million Canadian Social Insurance numbers and 80,000 bank account numbers

Cost: $300 million

Read more here

Officials in Jackson County, Georgia, paid $400,000 to cyber-criminals this week to get rid of a ransomware infection and regain access to their IT systems.

Georgia have ended up paying millions to rebuild their IT network following a similar ransomware attack in March 2018, a cost which ballooned from the initially estimated $2.6 million to around $17 million.

Cost: $17.4 million

Read more here

One of the biggest credit reporting agencies in the United States has reached a $650 million settlement over a massive security breach in 2017.

About 145 million users’ personal data was affected, including names, addresses and social security numbers.

Cost: $650 million

Read more here

"The WannaCry cyberattack which hit 200,000 computers across the world was the result of a 'huge screw-up' by the U.S. government as a result of its spying practices, Wikipedia founder Jimmy Wales told CNBC"

Cost: 200,000 computers infected

Read more here

"After a data breach at Verizon Enterprise Solutions, a prominent member of a closely guarded underground cybercrime forum posted a thread advertising the sale of a database containing the contact information on some 1.5 million customers of Verizon Enterprise." The entire database was priced at $100,000, or $10,000 for each set of 100,000 customer records.

Cost: $87 million

Read more here

Better known as the Panama Papers, 11.5 million leaked documents that detail financial and attorney–client information for more than 214,488 offshore entities. The leaked documents were created by Panamanian law firm and corporate service provider Mossack Fonseca; some date back to the 1970s.

Cost: 11.5 million documents leaked

Read more here