Data Breach - Over 670,000 Affected by Marquis Software Attack
Basically, a software company for banks had a data breach affecting over 670,000 people.
A massive data breach at Marquis Software has impacted over 670,000 individuals. Sensitive information, including Social Security numbers, has been exposed. This incident raises serious privacy concerns for numerous financial institutions involved. Stay alert for updates and protective measures.
What Happened
In August 2025, a significant cyberattack targeted Marquis Software, a vendor that provides essential communication tools for financial institutions. The breach, which was discovered on August 14, exposed the personal information of 672,075 individuals. Initially, Marquis Software informed regulators about the breach in November, stating that at least 74 banks and credit unions were affected. However, the full extent of the impact was not disclosed until now.
The company promptly notified law enforcement and engaged cybersecurity experts to investigate the breach. The investigation revealed that hackers had successfully copied files from Marquis Software's systems, leading to a substantial data exposure.
Who's Affected
The breach has affected a wide range of individuals whose sensitive information is now at risk. The leaked data includes names, addresses, phone numbers, Social Security numbers, Taxpayer Identification Numbers, dates of birth, and financial account information. While Marquis Software initially listed 74 impacted financial institutions, estimates from legal sources and cybersecurity researchers suggest that the total number of victims could be as high as 1.35 million.
Interestingly, some banks that were impacted did not appear on the original list of affected institutions. This discrepancy raises concerns about the thoroughness of the initial breach notifications and the overall transparency of the situation.
What Data Was Exposed
The data that was compromised is particularly sensitive. It includes personal identifiers such as Social Security numbers and financial details that could lead to identity theft. Banks typically enter extensive customer information into Marquis Software’s platform, including account balances and interaction histories. This means that the hackers potentially accessed a wealth of information that could be exploited for various malicious purposes.
Despite the severity of the breach, multiple banks clarified that the hackers did not breach their own systems. They only accessed data maintained by Marquis Software, which underscores the importance of third-party vendor security in the financial sector.
What You Should Do
If you believe you may be affected by this breach, it’s crucial to take immediate action. Start by monitoring your financial accounts for any suspicious activity. Consider placing a fraud alert or a credit freeze on your accounts to prevent identity theft. Additionally, be vigilant about any communications from your financial institutions regarding this incident.
Marquis Software has not confirmed whether a ransom was paid to the attackers, which adds another layer of complexity to the situation. Stay informed by following updates from both Marquis Software and your financial institution to ensure you are aware of any further developments regarding the breach.
The Record