An employee at CB Financial Services (Community Bank) uploaded customer data, including names, Social Security numbers, and dates of birth, into an unapproved personal AI application while preparing a presentation, despite the bank having its own approved AI tools available. The bank discovered the incident and filed a material-event disclosure with securities regulators, reportedly the first such filing to cite unauthorized AI use as the cause. The bank stated there was no disruption to accounts, payment systems, or core IT infrastructure and it expects no material financial impact.