Eurofiber data breach: 10K accounts exposed
Severity: medium · Patch status: no-fix-needed · Since 2025-11-20
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. Exposed data: email addresses, names, phone numbers. The breach dates from Nov 13, 2025; Have I Been Pwned loaded it on Nov 20, 2025.
What to do
- If you had a Eurofiber account, change its password and the password of any other account that reused it.
- Turn on multi-factor authentication wherever it is offered.
- Check whether your addresses are in this breach at https://haveibeenpwned.com.
- Expect targeted phishing that quotes the leaked details; verify any unexpected contact out of band.
Sources
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