MemberSource Credit Union data breach

Clerk's notes

MemberSource Credit Union, a financial cooperative, formally reported a data security incident to the Montana Attorney General on May 5, 2026. This filing indicates an unauthorized access event impacting the institution's digital network infrastructure, with the breach date identified as June 3, 2025. The investigation into the scope and impact of this security lapse is currently in a monitoring status.

According to the report, the exposed information includes several critical categories of personal and financial data. Specifically, individuals may have had their Full Name, Social Security Number, Financial Account Number, Date of Birth, Routing Number, Credit Score Information, Transaction History, and Mailing Address compromised. The exposure of such comprehensive details creates significant risks for those affected.

Such sensitive data can be leveraged by malicious actors for various fraudulent activities. This includes potential identity theft, opening unauthorized accounts, or conducting illicit financial transactions. Given that credit unions manage extensive personal financial records, members are advised to closely monitor their financial statements and credit reports for any suspicious activity.

Financial institutions like MemberSource Credit Union are subject to strict regulatory requirements, including federal and state laws, to protect member data. A breach of this nature raises questions about the adequacy of existing data security protocols and whether all necessary safeguards were in place to prevent unauthorized access to confidential information.

If you have received a data breach notification letter from MemberSource Credit Union, it confirms your information was compromised. This notification establishes a basis to understand your legal rights and explore potential recourse. Our firm offers a free, no-obligation case review to discuss what this incident means for you and whether pursuing legal action may be appropriate. There are no out-of-pocket costs for this review.

If a notification letter about this breach reached you, see every Montana data breach on file or browse all cases.