Industry — Data Breach
Executive Summary
Bank software vendor Marquis says more than 670,000 impacted by August breach
What Happened
Bank software vendor Marquis experienced a data breach in August 2026 that has impacted more than 670,000 individuals. The company provides software that enables financial institutions to communicate with their customers. Marquis initially disclosed in November that the breach affected at least 74 banks, credit unions, and other financial institutions.
Who Is Affected
More than 670,000 individuals who are customers of at least 74 financial institutions are impacted by this breach. The affected institutions include banks, credit unions, and other financial organizations that use Marquis software for customer communications.
Why It Matters
This breach demonstrates the cascading privacy risks that emerge when third-party vendors serving multiple financial institutions are compromised. A single breach at a software provider has exposed customer data across dozens of independent financial organizations, affecting hundreds of thousands of people who may not have been aware their information was handled by this vendor.
What You Should Do
Contact your bank or credit union to determine if they use Marquis software and whether your information was affected by this breach. Monitor your financial accounts closely for any unauthorized activity and consider placing a fraud alert or credit freeze with the major credit bureaus if your institution confirms you were impacted.
AI-Assisted
Event summaries are generated by Claude AI from verified sources and reviewed by humans before publication.