Major data breach at US credit union sees 172,000 customers at risk - here's how to stay safe

• Connex Credit Union confirm suffering major data breach
• Customer data stolen, and the attackers have not been identified
• Users are warned to be wary of suspicious incoming emails

Financial cooperative Connex Credit Union has revealed it suffered a cyberattack in which it lost sensitive data on around 172,000 customers.

The company confirmed the news in a new filing with the Office of the Maine Attorney General, as well as via data breach notification letters it sent to affected individuals.

In the letter, the company said it experienced “unusual activity” on its network on June 3, 2025, and after an investigation concluded that an unauthorized third party stole sensitive files the day before. After almost a month of investigating, Connex determined that the threat actors stole people’s names, account numbers, debit card information, Social Security numbers (SSN), and other government identification information needed to open an individual’s account ...