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MemberSource Credit Union data breach

Incident readout

Company
MemberSource Credit Union
Reported to
Montana Attorney General
Filed
May 5, 2026
People affected
Not stated in the filing
Incident type in filing
Not stated
Our review
Investigation Open

Was this a ransomware attack?

The filing does not say ransomware was involved. We do not label an incident ransomware unless the company’s report says so. Whatever the cause, the steps to protect yourself and the legal question are the same.

What we know

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.

See every breach reported in Montana or read what to do after a ransomware attack.

After the MemberSource Credit Union incident: what to do and your options

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.
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. Signing up doesn't waive any legal rights you may have.
Can I sue MemberSource Credit Union over the data breach?
It depends on what was exposed, the law in Montana 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.
Do I need a MemberSource Credit Union data breach lawyer or attorney?
Whether the company's systems were encrypted by ransomware or data was simply taken, the legal question is the same: did it protect your information the way the law requires? An attorney can review your notice for free, and these cases are usually handled on contingency.
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 Montana 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.
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.

Other breaches reported in Montana

Attorney advertising. This page reflects a public regulator filing; it does not mean a lawsuit has been filed or that the company did anything unlawful. Submitting a review request does not create an attorney-client relationship.