SonicWall Sued by Marquis Over Alleged Breach Failures

A recent data breach at Marquis, a fintech company that provides marketing and compliance solutions to over 700 banks and credit unions, occurred on August 14, 2025. The attackers gained access to Marquis's IT network and client data, including personally identifying information belonging to customers of some of its clients, with more than 780,000 people reportedly affected. The breach is attributed to SonicWall, the company's firewall vendor, which was itself breached on September 17, 2025, resulting in the theft of customers' firewall configuration files that could have been used for follow-on attacks. Marquis has now filed a complaint with the US District Court for the Eastern District of Texas seeking damages from SonicWall, marking a shift towards enterprises suing their cybersecurity vendors for contribution or negligence.