Billion-Dollar Bank Warns 7,537 Customers After Data Breach Triggers Unauthorized Account Access

A top 100 US bank just disclosed a data breach affecting the personal and confidential information of thousands of customers.

In a filing with the Office of the Maine Attorney General, Arkansas-based Arvest Bank says it’s warning 7,537 people after a technical glitch enabled unauthorized account access.

“We recently experienced a brief technical issue during routine system updates late on Thursday, April 24. This issue temporarily allowed a limited number of customer accounts to be viewable by another customer during online banking…

Our team quickly detected and resolved the matter, temporarily disabling some online functions until everything was fixed. We were able to fully restore online banking and Arvest Go by the afternoon of Friday, April 25, 2025.”

The lender says the sensitive information includes names, account numbers, account balances and account activity.

Arvest Bank is offering credit monitoring and identity theft recovery services to affected customers.

The bank also says customers who are very concerned about becoming a victim of fraud or identity theft can place a security freeze on their credit files at no cost by contacting any of the three major nationwide credit reporting companies – Equifax, Experian or TransUnion.

As of December 2024, Arvest Bank had nearly $27 billion in total assets, making it the 72nd-largest bank in the US, according to the Federal Reserve.

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