Marquis Data Breach Impacts Over 74 Us Banks, Credit Unions 2025

Financial software provider Marquis Software Solutions is warning that it suffered a data breach that impacted dozens of banks and credit unions across the US.

Marquis Software Solutions provides data analytics, CRM tools, compliance reporting, and digital marketing services to over 700 banks, credit unions, and mortgage lenders.

In data breach notifications filed with US Attorney General offices, Marquis says it suffered a ransomware attack on August 14, 2025, after its network was breached through its SonicWall firewall.

This allowed the hackers to steal "certain files from its systems" during the attack.

"The review determined that the files contained personal information received from certain business customers," reads a notification filed with Maine's AG office.

"The personal information potentially involved for Maine residents includes names, addresses, phone numbers, Social Security numbers, Taxpayer Identification Numbers, financial account information without security or access codes, and dates of birth."

Marquis is now filing notifications on behalf of its customers, in some cases breaking down the number of people impacted per bank in a state. These notifications state that similar data was exposed in the attack for customers in other U.S. states.

According to notifications filed in Maine, Iowa, and Texas, over 400,000 customers have been impacted from the following 74 banks and credit unions.

At this time, Marquis says that there is no evidence that data has been misused or published anywhere.

However, as previously reported by Comparitech, a now-deleted filing by Community 1st credit union claimed that Marquis paid a ransomm, which is done to prevent the leaking and abuse of stolen data.

Source: BleepingComputer