Bouygues Telecom data breach: 5.7M accounts exposed
Severity: high · Patch status: no-fix-needed · Since 2025-09-24
In August 2025, the French telecommunications company Bouygues Telecom detected a cyber attack against their services. The incident resulted in a data breach that exposed almost 6.4M customer records, including 5.7M unique email addresses. The breach also exposed names, physical addresses, phone numbers, dates of birth and IBANs (International Bank Account Numbers). Bouygues Telecom advised that all affected customers had been notified about the incident. Exposed data: bank account numbers, dates of birth, email addresses, names, phone numbers, physical addresses. The breach dates from Aug 4, 2025; Have I Been Pwned loaded it on Sep 24, 2025.
What to do
- If you had a Bouygues Telecom 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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