DataBreachInformation.com
Investigation OpenMassachusettsFiled January 16, 2026

Understanding your St. Mary's Credit Union data breach notification letter

If a St. Mary's Credit Union letter arrived in your mailbox, here is what it means, why you received it, and the free steps you can take right now.

Why you received this letter

St. Mary's Credit Union has reported a data security incident to regulators in Massachusetts. The financial institution announced that an event may have exposed personal information held by the credit union. An investigation into the scope and impact of the incident is currently underway.

What to do after the letter

  1. Confirm the notice is genuine

    A legitimate St. Mary's Credit Union notice references the specific incident reported to the Massachusetts Attorney General and describes which categories of your information were involved. Compare the letter against the public filing before acting on any links or phone numbers it contains.

  2. Keep the letter — it is your proof of connection

    The notification letter is the document that ties your personal information to this incident. Keep the original and photograph it. If you later request a case review, this letter is the strongest evidence that you were among the affected individuals.

  3. Protect your accounts and credit

    Depending on what was exposed, consider a free credit freeze with all three bureaus, new passwords for reused credentials, and monitoring of financial statements. These steps are free and do not require you to wait for anyone's permission.

  4. Check the record against the public filing

    You can verify the St. Mary's Credit Union incident against the filing reported to the Massachusetts Attorney General. This registry summarizes what was filed; it does not provide legal advice.

This page summarizes a data breach reported to the Massachusetts Attorney General for informational purposes. DataBreachInformation.com is a neutral reference registry and does not provide legal advice.