A major data breach at Marquis has compromised the personal information of hundreds of thousands of bank customers, creating concern across the financial sector.
The incident was discovered after suspicious activity was detected inside a system managed by Marquis for multiple banking clients.
Investigators believe attackers took advantage of a weakness in a connected Marquis service, allowing them to access customer records shared by several financial institutions.
The exposed data may include names, contact information, account-linked details, and demographic profiles used for customer analytics.
While the breach did not immediately indicate the theft of full account credentials, the information accessed is still significant.
Cybersecurity experts warn that criminals can use such data to launch targeted phishing attempts, impersonation scams, and other forms of fraud aimed at unsuspecting customers.
Banks relying on Marquis have begun notifying affected individuals and are reviewing how much customer information was stored in the compromised environment. Regulatory bodies have also been informed, and compliance procedures are underway.
Marquis confirmed the breach and stated that its teams are working with external specialists to understand how the attackers gained entry and how long they remained inside the system.
Enhanced security measures have already been deployed to prevent further exposure.
The incident highlights ongoing challenges with third-party data handlers in the financial sector. As banks adopt more external platforms for operations and analytics, attackers increasingly look for weaknesses outside the bank’s own infrastructure.
Customers are being urged to stay cautious, monitor their accounts, and remain alert to unusual emails, calls, or verification requests linked to their financial accounts.
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