DataBreachCaseFile.com
Investigation OpenMT AG filing · May 5, 2026

MemberSource Credit Union Discloses Data Incident Filing

MemberSource Credit Union has filed a public report regarding a data incident that occurred on June 3, 2025. The filing, submitted on May 5, 2026, confirms that an investigation into potential exposure of personal information is underway. Individuals associated with the credit union should review their personal accounts for unusual activity.

State
MT
Breach date
June 3, 2025
Reported
May 5, 2026

MemberSource Credit Union, based in Montana, has formally acknowledged a data incident through a public regulatory filing. This disclosure provides details about an event that may involve personal information.

The credit union reported that this incident took place on June 3, 2025. A public filing detailing this event was submitted on May 5, 2026, indicating that an investigation into the matter is currently in progress.

While the specific type of breach and the categories of personal information potentially involved were not detailed in the filing, the disclosure confirms that individuals' data may have been affected. The full nature and scope of the exposure remain under investigation.

Individuals who may be impacted by this incident should remain vigilant. Regularly monitor financial accounts and credit reports for any suspicious transactions or unauthorized activity. Consider placing a fraud alert on your credit files as a precautionary measure.

It is also advisable to reset passwords for any online accounts that share credentials, especially those related to financial services. Use strong, unique passwords for each account and enable multi-factor authentication whenever available to add an extra layer of security.

All information regarding this data incident for MemberSource Credit Union is derived from public regulatory filings, consistent with the requirements for transparency surrounding such events.

What to do if you were affected

These general steps can help limit the risk of identity theft and fraud after any data breach.

  • 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.

MemberSource Credit Union breach filing: questions and answers

Where can I see the official MemberSource Credit Union breach notice?
MemberSource Credit Union's report is published by the MT Attorney General: https://dojmt.gov/office-of-consumer-protection/reported-data-breaches/#mt-membersource-credit-union-2026 Compare it with the letter you received to confirm the dates and details match.
Is there a MemberSource Credit Union data breach class action lawsuit?
Law firms often open an investigation after a breach notice like this one, and a class action lawsuit may follow. This page doesn't confirm that a lawsuit has been filed against MemberSource Credit Union. You usually don't have to join a class action to be included — if a settlement is reached, class members are notified and can file a claim.
Is the MemberSource Credit Union data breach letter legit or a scam?
A notice from MemberSource Credit Union in the mail matches the breach MemberSource Credit Union reported to the MT Attorney General on May 5, 2026. Check that the company name and dates in your letter match that filing. A real notice of data security incident won't ask for your password, Social Security number or a payment — if it does, contact MemberSource Credit Union through a phone number or website you find yourself.
Can I sue MemberSource Credit Union over the data breach?
It depends on what was exposed, the law in MT and your own state, and whether you've been harmed. Most people take part through a class action rather than suing alone. Keep your notification letter — it's the proof that connects you to the breach.
How much could a MemberSource Credit Union data breach settlement or claim be worth?
There is no set amount, and no MemberSource Credit Union settlement is confirmed here. In past data breach settlements, payments depended on what data was exposed and on documented losses — fraud, out-of-pocket costs and time spent dealing with the breach. Keep receipts and records; they're what damages claims are built on.
Did MemberSource Credit Union offer free credit monitoring?
Check your letter from MemberSource Credit Union. If free credit or identity monitoring is offered, the enrollment code and deadline are printed in the notice itself. Enrolling does not give up your right to bring a claim.
Do I need a MemberSource Credit Union data breach lawyer or attorney?
An attorney can read your notice and tell you whether a claim makes sense. A case review here is free, and data breach cases are usually handled on contingency, so there is no upfront cost.
What should I do after getting the MemberSource Credit Union data breach notice?
Keep the letter and the envelope, and note the date it arrived. Freeze your credit with Equifax, Experian and TransUnion, change any passwords the notice mentions, and sign up for any free credit monitoring the letter offers. Then check whether you may have a claim.

Source: MT Attorney General filing

Related data breach cases