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Marquis Data Breach Affects Multiple U.S. Banks and Credit Unions

Marquis Data Breach Affects Multiple U.S. Banks and Credit Unions

First seen 4 Dec 2025, 12:42 UTC • •

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

A data breach involving fintech firm Marquis has compromised the information of dozens of U.S. banks and credit unions. The incident was triggered by a zero-day vulnerability that was exploited before it was known to SonicWall or its customers.

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