Marquis ransomware attack leaks financial data of more than 670,000 people
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 brought a lawsuit claiming that a breach of SonicWall's cloud backup led to the attack.
Key facts
- Affected organisation
- Marquis
- Incident type
- Ransomware
- Occurred / detected
- Not confirmed
- Scale of damage
- Personal and financial information of more than 672,000 people stolen
- Cause / method
- Ransomware attack; Marquis claims a breach of SonicWall's cloud backup was the cause
- Location
- United States
Timeline
- It was disclosed that the data breach resulting from the ransomware attack had affected more than 74 US banks and credit unions.
- The scale of the damage was tallied at 80 financial institutions and 824,000 consumers.
- Marquis pointed to a hack of SonicWall's cloud backup as the cause of the ransomware breach.
- It was disclosed that Marquis had sued SonicWall, claiming that security flaws in its firewall backup led to the ransomware attack.
- Marquis said the personal and financial information of more than 672,000 people had been stolen.
17 related reports
- Marquis Software Solutions Data Breach Impacts Over 1.3M Exposing Social Security Numbers
- Marquis data breach impacts over 74 US banks, credit unions
- Fintech firm Marquis alerts dozens of US banks and credit unions of a data breach after ransomware attack
- Marquis Data Breach Impacts Over 780,000 People
- Data breach at Marquis Software Solutions affected over 780,000 people
- Ransomware Attack at Fintech Software Solutions Firm Marquis Impacts Dozens of Banks and Credit Unions
- Two more banks notifying thousands of victims about Marquis Software ransomware attack
- Marquis breach toll rises to 80 banks, 824,000 consumers
- Marquis blames ransomware breach on SonicWall cloud backup hack
- Marquis sues firewall provider SonicWall, alleges security failings with its firewall backup led to ransomware attack
- Marquis sues SonicWall over backup breach that led to ransomware attack
- Marquis Sues SonicWall, Alleges 2025 Cloud Flaw Led To Ransomware Hit
- Marquis says over 672,000 people had personal and financial data stolen in ransomware attack
- Marquis: Ransomware gang stole data of 672K people in cyberattack
- Marquis Data Breach Affects 672,000 Individuals
- Software firm Marquis says data of 672k bank customers stolen in ransomware attack
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The summary and key facts are written by AI from related reports and may contain errors. Check the original articles and the organisation’s official statements for accurate details.