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Data breaches → Flashback

Was your data in the Flashback breach?

2015 · flashback.se · ~40,256 accounts exposedCritical severity · 10/10

Flashback (flashback.se) suffered a data breach in 2015 that exposed around 40,256 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 2015, the Swedish forum known as Flashback had sensitive internal data on 40k members published via the tabloid newspaper Aftonbladet. The data was allegedly sold to them via Researchgruppen (The Research Group) who have a history of exposing otherwise anonymous users, primarily those who they believe participate in "troll like" behaviour. The compromised data includes social security numbers, home and email addresses.

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 Flashback breach exposed and what each item actually enables:

Government identifiers

The strongest identity-theft material there is — enough to open credit accounts or file fraudulent claims in your name.

Home addresses

Home addresses feed people-search and data-broker sites, which republish them publicly. They also make phishing far more convincing and, in the worst cases, enable real-world harassment.

Email addresses

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.

What to do if you were affected

These steps are ordered for this specific breach — the most urgent action given what leaked comes first.

  1. Government identifiers: Consider a credit freeze or fraud alert with the credit reference agencies, and watch for accounts you did not open.
  2. Home addresses: Get your address removed from data brokers — they re-list roughly every four months, so this needs repeating.
  3. Email addresses: Treat any message referencing this service with suspicion, and never act on links in unexpected emails.
  4. Check whether your own email appears in this breach — run a free scan to confirm before you spend time on the steps above.

This breach put your details on data-broker sites

Because Flashback exposed home addresses, this is one of the breaches that feeds people-search and data-broker sites. Those sites scrape leaked databases, combine them with public records, and republish the result as a searchable profile — which is how a single breach turns into a permanent public listing. Removal works, but brokers typically re-list within about four months, so it has to be repeated.

See our broker-by-broker removal guides →

How urgent is this now?

This breach is over 11 years old. Old credentials still cause harm — leaked passwords from a decade ago are still tried against new accounts every day.

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.

Check if your email was exposed.Nullivo's free scan checks your own verified email against known breaches — including Flashback — in 30 seconds. No password, no signup, and we only ever scan your own email. Run your free scan →

Frequently asked questions

What data was exposed in the Flashback breach?

The Flashback breach exposed government identifiers, home addresses, email addresses. The strongest identity-theft material there is — enough to open credit accounts or file fraudulent claims in your name.

How many people were affected by the Flashback breach?

Around 40,256 accounts were exposed, making it a smaller, more targeted breach.

What should I do if I had a Flashback account?

Consider a credit freeze or fraud alert with the credit reference agencies, and watch for accounts you did not open. 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 Flashback breach affected you, these breaches exposed comparable information — worth checking too, since leaked datasets are routinely combined.

See all breaches we cover →