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Data Breach Affects 400K Customers of Marquis Fintech Firm

Data Breach Affects 400K Customers of Marquis Fintech Firm

First seen 20 Dec 2025, 23:59 UTC • •

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ThreatCluster AI
ThreatCluster •March 12, 2026 at 13:27 UTC

A significant data breach linked to U.S. fintech firm Marquis has compromised the personal information of at least 400,000 bank customers. Hackers exploited an unpatched vulnerability in a SonicWall firewall, primarily impacting residents in Texas, where over 354,000 individuals are affected. The number of impacted customers is expected to increase as more breach notifications are issued.

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