Fintech firm Marquis alerts dozens of US banks and credit unions of a data breach after ransomware attack

Fintech company Marquis is notifying dozens of U.S. banks and credit unions that they had customer data stolen in a cyberattack earlier this year.

Details of the cyberattack emerged this week after Marquis filed data breach notices with several U.S. states confirming its August 14 incident as a ransomware attack.