Co-op Credit Union Data Breach Lawsuit Investigation
By Join The Case · Published October 21, 2025 · Updated October 28, 2025 · 5 min read
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Dapeer Law, P.A., a top-rated class action law firm, is investigating the Co-op Credit Union data breach. If you received notice that your information was exposed during this breach, you may be entitled to compensation. It's free to join our investigation to see if we can help you recover.

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Co-op Credit Union Data Breach Lawsuit Investigation

An employee-email intrusion at Co-op Credit Union compromised sensitive member data between April 8 and April 18, 2025. Regulators confirm that at least 26 residents—8 in Massachusetts and 18 in Montana— were notified. If you received a breach letter, you may be entitled to free identity-theft services and potential compensation—request a no-cost legal consultation today.

Key Details at a Glance

  • Breach window: April 8 – April 18, 2025
  • Notice filed: October 21, 2025 (Massachusetts) and October 20, 2025 (Montana)
  • Total people affected: 26 (8 MA, 18 MT)
  • Data exposed:
    • Massachusetts: Names, Social Security numbers, credit/debit card numbers
    • Montana: Names
  • Free protection offered: Experian IdentityWorksSM Credit 3B (two years for MA, one year for MT)

What Happened

Co-op Credit Union discovered that an unauthorized party briefly accessed an employee email account. A third-party forensic firm confirmed the intrusion lasted from April 8 to April 18, 2025. Investigators reported that information stored in the mailbox may have been downloaded during that period.

Information Involved

A detailed review completed July 23, 2025, determined that the compromised mailbox held:

  • Member names (MA & MT)
  • Social Security numbers (MA only)
  • Credit or debit card numbers (MA only)

Company Response

After securing the email environment, Co-op Credit Union:

  • Engaged a digital forensics team to confirm the scope of access
  • Implemented additional safeguards to reduce future risk
  • Arranged complimentary enrollment in Experian IdentityWorks Credit 3B for affected individuals (two years for MA residents, one year for MT residents)
Download MA Official Breach Notice (PDF) Download MT Official Breach Notice (PDF)

Your Next Steps

Even if no misuse has been reported, data-breach victims should remain vigilant:

  • Activate the free Experian monitoring using the instructions in your letter
  • Review bank and credit-card statements for unfamiliar transactions
  • Request free credit reports and place a fraud alert or security freeze if necessary
  • Retain all breach correspondence in case future legal action or reimbursement is needed

Considering legal action? Our consumer-privacy attorneys can evaluate your claim at no cost.

Company Overview

Co-op Credit Union is a Wisconsin-based financial cooperative serving members since 1938.

Frequently Asked Questions

How many people did the Co-op Credit Union breach affect?

The credit union reported the incident to regulators for 26 affected residents — 8 in Massachusetts and 18 in Montana.

What personal data was exposed in the Co-op Credit Union breach?

For Massachusetts residents, names, Social Security numbers, and credit/debit card numbers were potentially accessed. For Montana residents, only names were involved.

Is Co-op Credit Union offering free credit monitoring?

Yes. Impacted individuals can enroll in a complimentary Experian IdentityWorks Credit 3B membership (two-year term for MA, one-year term for MT).

Can I file a lawsuit against Co-op Credit Union for this data breach?

Possibly. Data-privacy laws allow victims to seek damages for costs, time, and emotional distress caused by a breach. Contact our firm for a free evaluation.

When did Co-op Credit Union discover the breach?

The intrusion was identified during an internal investigation and confirmed by forensic experts. Notification letters were issued after the review was completed on July 23, 2025, with regulatory filings on October 20–21, 2025.

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