Troy Hunt's Mailchimp List Data Breach

What happened?

In March 2025, a phishing attack successfully gained access to Troy Hunt's Mailchimp account and automatically exported a list of people who had subscribed to the newsletter for his personal blog . The exported list contained 16k email addresses and other data automatically collected by Mailchimp including IP address and a derived latitude, longitude and time zone.

When did it happen?

The breach date in the public record is March 25, 2025. The record was added to the catalogue on March 25, 2025 and last updated there on March 29, 2025.

What information was reported as exposed?

• Email addresses
• Geographic locations
• IP addresses
• Latitude and longitude pairs

These are incident-level categories. The record does not prove that every category was exposed for every affected person.

Who may be affected?

This record may be relevant to people who had an account or other relationship with Troy Hunt's Mailchimp List or used troyhunt.com around March 25, 2025. A catalogue entry does not establish that every customer was affected or that every listed data category applied to each person. Compare the record with an official notice addressed to you.

What should you do?

Choose actions that match the information involved. If you find signs that someone is using your identity, the Federal Trade Commission provides a personal recovery plan at IdentityTheft.gov.