Mainstreet Credit Union Reports Data Security Incident in Indiana

Mainstreet Credit Union, a financial institution providing banking services in Indiana, reported a data security incident to the Indiana Attorney General on May 4, 2026. The credit union indicated that an incident involving unauthorized access to their systems occurred on or around January 12, 2026.

The public filing states that the incident involved unauthorized access, potentially compromising personal information held within Mainstreet Credit Union's systems. The specific types of data exposed were not detailed in the public record, but the credit union is investigating the scope of the event.

If you received a data breach notification letter from Mainstreet Credit Union, it means that your personal information may have been involved in this incident. Such notices are sent to inform affected individuals about the situation and advise on protective measures.

It is recommended that individuals who received a notification remain vigilant by regularly monitoring their financial accounts and statements for any suspicious transactions or unauthorized activity. Reviewing credit reports periodically for unexpected accounts or inquiries is also a wise precaution.

Additionally, be cautious of unsolicited communications, such as emails, phone calls, or text messages, that request personal information. Cybercriminals often use breach events as an opportunity for phishing scams. Always verify the authenticity of any communication claiming to be from Mainstreet Credit Union.

This information is based on public filings submitted to the Indiana Attorney General. For additional details or specific questions regarding your account, it is best to directly contact Mainstreet Credit Union.