Marquis security incident history
Hacking, data breaches and other security incidents involving Marquis, with related coverage.
Incidents: 1 · Most recent
Marquis ransomware attack leaks financial data of more than 670,000 people
672KImpact: Personal and financial information of more than 672,000 people stolen
Financial software company Marquis was hit by a ransomware attack, and bank customers' personal and financial information was stolen. Multiple banks and credit unions were affected and notified victims, and the scale of the damage disclosed in March 2026 is more than 672,000 people. Marquis filed a lawsuit claiming that a breach of SonicWall's cloud backup led to the attack.
Related reports: 17 · last report →