Hello. An "unauthorized" AI application exposed sensitive customer data at a regional U.S. bank. 

Community Bank, a unit of CB Financial Services in Carmichaels, Pa., said the extent of the breach makes the incident material. Customer names, Social Security numbers and dates of birth are among the compromised information, the bank said in a filing with the Securities and Exchange Commission.

"The incident did not involve a disruption to the Bank's operations, customer access to accounts or services, payment systems, or core information technology infrastructure; however, due to the volume and sensitive nature of the non-public information at issue, on May 7, 2026, the Company determined the event to be material," the filing said. Community Bank operates in Pennsylvania, Ohio and West Virginia.

The bank didn't provide details about how the breach happened or the AI software in question, saying an investigation is underway. 

More news below. 

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The WSJ Pro Cybersecurity team is Deputy Bureau Chief Kim S. Nash and reporters Angus Loten and James Rundle. Follow us on X @WSJCyber. Reach the team by replying to any newsletter you receive or by emailing Kim at kim.nash@wsj.com.