Data breaches → Adpost
Was your data in the Adpost breach?
2025 · adpost.com · ~3,339,512 accounts exposedLow severity · 3/10
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 details sourced from Have I Been Pwned, the industry-standard breach database. 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:
Links this leak to your other accounts — a reused username lets anyone build a profile of you across platforms.
Puts you on spam and phishing lists, and confirms to attackers that you hold an account with this service — which makes impersonation emails more believable.
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.
- Check whether your own email appears in this breach — run a free scan to confirm 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.
- Was your data in the Thermomix Recipe World Forum breach? (2025, ~3,123,439 accounts)
- Was your data in the Beckett Collectibles breach? (2025, ~1,041,238 accounts)
- Was your data in the Sysco breach? (2026, ~2,691,852 accounts)
- Was your data in the Lexipol breach? (2025, ~672,546 accounts)
- Was your data in the SoundCloud breach? (2025, ~29,815,722 accounts)
- Was your data in the International Kiteboarding Organization breach? (2025, ~340,349 accounts)