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Adpost data breach

From Breaches, in the HARD wiki · Updated
This article is about the February 2025 breach of Adpost. For every breach, see Breaches.

The Adpost data breach exposed 3,339,512 accounts from adpost.com in February 2025. The data taken includes usernames, names and email addresses.[1]

Have I Been Pwned verified it and added it to its search on 7 Oct 2025, 8 months later. It is the 252nd largest of the 618 breaches in HARD’s list.

What was exposed

Adpost’s breach included 3 kinds of data. What each lets criminals do:

DataWhat it’s used for
UsernamesHalf of a login. With a reused password, it opens other accounts.
NamesMakes scam messages personal enough to believe.
Email addressesExpect scam emails that name the company to look genuine.

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, Adpost among them, without showing the data.
  2. Turn on two-step sign-in.On Adpost (adpost.com) and your email, so leaked sign-in details aren’t enough on their own.
  3. Distrust messages that mention Adpost.Scammers use breach data to sound genuine. Don’t click links in emails or texts about the breach; go to the site yourself.

Timeline

  • : the breach, as best it can be dated.
  • : Have I Been Pwned verifies the data and adds it to its search, 8 months later.
  • : 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. “Adpost”, Have I Been Pwned, added 7 Oct 2025. Breach data licensed CC BY 4.0.