Breach date: 2025-03-25. Added to this index: 2025-03-25. Accounts affected: about 17K. Domain: troyhunt.com.
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.
Breach data sourced from Have I Been Pwned, used under CC BY 4.0. Additional breach metadata provided by XposedOrNot. DataExposed is an independent service and is not affiliated with or endorsed by either.
What was exposed
Email addresses: The email address you used to register or log in. It is the most common field in breaches because it doubles as your username on most sites.
Geographic locations: A general location recorded on your account, such as a country, state, city, postcode or region, either typed in by you or estimated from your IP address.
IP addresses: The network addresses your devices used when you signed up, logged in or posted, recorded by almost every website in its access logs.
Latitude and longitude pairs: Precise map coordinates recorded by apps, photos, fitness trackers, delivery services or dating apps, often with a timestamp and sometimes accurate to a single building.
What to do now
Check whether your own address is in this dataset with the free email breach check.
Review the accounts connected to this service and turn on two-factor authentication.
Turn on two-factor authentication on your email account first, because it is the reset path for everything else.
Treat calls and messages that quote real details about you as hostile until you verify them another way.
Frequently asked questions
What data was leaked in the Troy Hunt's Mailchimp List breach?
The Troy Hunt's Mailchimp List breach exposed Email addresses, Geographic locations, IP addresses, Latitude and longitude pairs. About 17K accounts were affected.
Was I affected by the Troy Hunt's Mailchimp List breach?
Run the free email breach check with the address you used on that service. It will tell you whether your address appears in this dataset.
What should I do about the Troy Hunt's Mailchimp List breach?
Treat any message that quotes details from this breach as suspicious, turn on two-factor authentication, and consider removing your details from people-search sites if your address or phone was included.