Was your data in the Adpost breach?
Check whether your email address was in it
Check my exposureFree. No password — we email you a six-digit code. This breach and every other one your address appears in.
Adpost (adpost.com) suffered a data breach in 2025 that exposed around 3,339,512 accounts. If you had an account, some of your personal data may be circulating in leaked databases. The fastest way to know is to check your own email — free, in about 30 seconds, no password required.
What happened
In February 2025, data obtained from an earlier Adpost breach surfaced. The dataset contained 3.3M records including email addresses, usernames, and display names. Adpost later published a disclosure notice and advised they'd forced a credential refresh, among other actions.
Breach record from Have I Been Pwned, CC BY 4.0. Risk analysis by Nullivo.
What was exposed, and why it matters
Not all breaches carry the same risk — what matters is which fields leaked. Here is what the Adpost breach exposed and what each item actually enables:
Also listed in this breach: Email addresses, Names, Usernames.
What to do if you were affected
These steps are ordered for this specific breach — the most urgent action given what leaked comes first.
- Names and usernames
Search your usual username to see what else it exposes, and use distinct handles for sensitive accounts. - Email addresses
Treat any message referencing this service with suspicion, and never act on links in unexpected emails. - Confirm you were actually in it
Run a free scan before you spend time on the steps above.
How urgent is this now?
This breach is recent, so the data is actively traded and the risk is at its highest right now.
Remember: a breach can’t be “un-leaked” — once a database is out, it exists in countless copies. The goal is to make the leaked data useless: change what can be changed, lock down what can’t, and remove what has been republished.
Frequently asked questions
What data was exposed in the Adpost breach?
The Adpost breach exposed names and usernames, email addresses. Links this leak to your other accounts — a reused username lets anyone build a profile of you across platforms.
How many people were affected by the Adpost breach?
Around 3,339,512 accounts were exposed, making it a large breach.
What should I do if I had a Adpost account?
Search your usual username to see what else it exposes, and use distinct handles for sensitive accounts. You can check whether your own email appears in this breach with a free Nullivo scan — no password required.
Breaches that exposed similar data
If the Adpost breach affected you, these breaches exposed comparable information — worth checking too, since leaked datasets are routinely combined.