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Troy Hunt's Mailchimp List data breach

From Breaches, in the HARD wiki · Updated
This article is about the March 2025 breach of Troy Hunt's Mailchimp List. For every breach, see Breaches.

The Troy Hunt's Mailchimp List data breach exposed 16,627 accounts from troyhunt.com in March 2025. The data taken includes email addresses, geographic locations, IP addresses and latitude and longitude pairs.[1]

Have I Been Pwned verified it and added it to its search on 25 Mar 2025, within a month. It is the 607th largest of the 618 breaches in HARD’s list.

What was exposed

Troy Hunt's Mailchimp List’s breach included 4 kinds of data. What each lets criminals do:

DataWhat it’s used for
Email addressesExpect scam emails that name the company to look genuine.
Geographic locationsRoughly where you live.
IP addressesRoughly where you were when you used the service.
Latitude and longitude pairsPersonal details that make scam messages more convincing.

What to do

  1. Check whether you’re in it.Search your email address on Have I Been Pwned. It tells you which breaches it appears in, Troy Hunt's Mailchimp List among them, without showing the data.
  2. Distrust messages that mention Troy Hunt's Mailchimp List.Scammers use breach data to sound genuine. Don’t click links in emails or texts about the breach; go to the site yourself.
  3. Expect the data to resurface.Breach data is sold and combined with other leaks for years. Stay wary of messages that know a little too much about you.

Timeline

  • : the breach, as best it can be dated.
  • : Have I Been Pwned verifies the data and adds it to its search, within a month.
  • : the entry was last updated.

Similar breaches

Breaches that leaked the same kinds of data, closest in time:

See Breaches for all 618, and Updates for keeping your devices patched.

References

  1. ^ Troy Hunt. “Troy Hunt's Mailchimp List”, Have I Been Pwned, added 25 Mar 2025. Breach data licensed CC BY 4.0.