Data breaches → Eurofiber
Was your data in the Eurofiber breach?
2025 · eurofiber.com · ~10,003 accounts exposedHigh severity · 7/10
Eurofiber (eurofiber.com) suffered a data breach in 2025 that exposed around 10,003 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 November 2025, Eurofiber France disclosed a data breach of its ticket management platform. Data containing 10k unique email addresses and a smaller number of names and phone numbers was subsequently leaked. A threat actor claiming responsibility for the breach alleges to have additional, more sensitive data including screenshots, VPN configuration files, credentials, source code, certificates, archives, and SQL backup files.
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 Eurofiber breach exposed and what each item actually enables:
Enables SIM-swap attacks (hijacking your number to intercept SMS codes), smishing, and voice scams that appear to come from your bank.
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.
What to do if you were affected
These steps are ordered for this specific breach — the most urgent action given what leaked comes first.
- Phone numbers: Move two-factor authentication off SMS to an authenticator app or passkey, and add a port-out PIN with your mobile provider.
- 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 Eurofiber breach?
The Eurofiber breach exposed phone numbers, names and usernames, email addresses. Enables SIM-swap attacks (hijacking your number to intercept SMS codes), smishing, and voice scams that appear to come from your bank.
How many people were affected by the Eurofiber breach?
Around 10,003 accounts were exposed, making it a smaller, more targeted breach.
What should I do if I had a Eurofiber account?
Move two-factor authentication off SMS to an authenticator app or passkey, and add a port-out PIN with your mobile provider. 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 Eurofiber breach affected you, these breaches exposed comparable information — worth checking too, since leaked datasets are routinely combined.
- Was your data in the Frame & Optic breach? (2025, ~15,678 accounts)
- Was your data in the Hello Cake breach? (2025, ~22,907 accounts)
- Was your data in the Chris Leong breach? (2024, ~27,096 accounts)
- Was your data in the TheSqua.re breach? (2025, ~107,041 accounts)
- Was your data in the Yonéma breach? (2024, ~35,962 accounts)
- Was your data in the Creams Cafe breach? (2025, ~159,652 accounts)