Data Breach Law Group Investigates the MemberSource Credit Union Data Breach
By Data Breach Law Group | Posted on May 5, 2026 · Montana
Miami, FL — Data Breach Law Group is investigating a data breach involving MemberSource Credit Union, reported to the Montana Attorney General on May 5, 2026. The firm is reviewing whether affected individuals have legal claims arising from the incident.
MemberSource Credit Union is a financial institution that provides banking, lending, and investment services to its members. As a credit union, the organization typically collects and maintains sensitive personal and financial data, including Social Security numbers, account numbers, and detailed transaction histories required for managing member assets. This data breach was officially reported to the Montana Attorney General in 2026, confirming that unauthorized access occurred within the credit union’s systems. If you received a data breach notification letter from MemberSource Credit Union, it indicates that your personal information was likely involved in this incident. We recommend reviewing the letter carefully to understand the specific scope of the exposure and following the provided instructions regarding credit monitoring services to protect your financial identity.
If you were affected
Stay alert to targeted scams
Be cautious of calls, texts, or emails that reference this breach. Legitimate organizations won't ask you to confirm sensitive details through an unsolicited message.
Keep your notification letter
Save the notice you received. It documents that your information was involved and is often needed to enroll in any credit monitoring offered or to join a related legal claim.
Did you receive a letter from MemberSource Credit Union?
A case review is free and confidential. Tell us about your letter and we will explain your options.