Mainstreet Credit Union Reports Data Breach Affecting Customers

Mainstreet Credit Union, based in Indiana, reported a data breach incident to regulators on May 4, 2026. The credit union stated that the breach event itself occurred on January 12, 2026. The specific nature of this incident and how it happened were not detailed in the public filing.

The regulatory filing from Mainstreet Credit Union did not specify the exact types of personal information that may have been compromised during this event. It is important to note that the investigation into the breach is still ongoing.

The total number of individuals whose data may have been affected by this breach was not provided in the publicly available record. Individuals who are members or have interacted with Mainstreet Credit Union around the breach date may be impacted.

Mainstreet Credit Union members should remain vigilant for unusual activity in their financial accounts and statements. It is always wise to regularly review credit reports for any unfamiliar entries.

Consider placing a fraud alert or security freeze on your credit files with the three major credit bureaus. Be cautious of unsolicited communications that request personal details, as these could be phishing attempts.