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Software firm Marquis says data of 672k bank customers stolen in ransomware attack

Finextra • March 19, 2026

Marquis Software Solutions, a provider of marketing and compliance technology to the financial services sector, says 672,075 people had their personal and financial information stolen in a ransomware attack last year.

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Ransomware Attack on Marquis Software Affects Over 670,000 Bank Customers Marquis Software Solutions reported that a ransomware attack last year compromised the personal and financial data of 672,075 individuals. The breach, which affected more than 74 banks, credit unions, and financial institutions, was initially warned about in November 2025. The attack vector and specific vulnerabilities exploited in the breach have not been detailed in the articles. The company provides software that facilitates communication between financial institutions and their customers. The incident highlights the ongoing risks associated with ransomware in the financial sector. As of now, no specific remediation steps or patches have been disclosed. The breach raises concerns about the security measures in place at affected institutions. Customers are advised to monitor their accounts for suspicious activity. 2 sources 62

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Software firm Marquis says data of 672k bank customers stolen in ransomware attack

The full story

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