MemberSource Credit Union Confirms Data Breach Filed in Montana

MemberSource Credit Union recently filed a data breach notification with the Montana Attorney General's office. This report confirms that unauthorized access to the credit union's systems took place on June 3, 2025. The filing itself was made public on May 5, 2026, as the credit union continues its investigation into the incident.

Public records indicate that personal information was involved in this security event. However, the specific categories of data impacted by the breach were not detailed in the available official filing. MemberSource Credit Union serves its members with various financial services, and like all such institutions, it manages sensitive data.

At the time of this report, MemberSource Credit Union states that an investigation into the scope and impact of the breach is ongoing. If you received a formal data breach notification letter directly from MemberSource Credit Union, it is an important document providing specific details relevant to your situation.

For those affected, it is generally recommended to remain vigilant for any suspicious activity. Regularly review your account statements and monitor for any unusual transactions or communications that may appear to be from the credit union or other financial institutions. Be cautious of unsolicited emails, phone calls, or texts asking for personal details.

It is always advisable to read any official breach notification letter you receive thoroughly. This letter should provide instructions on any specific actions recommended by MemberSource Credit Union, such as how to enroll in identity protection services if they are offered as a safeguard following the incident.