Bouygues Telecom confirms data breach impacting 6.4 million customers

What’s new: Bouygues Telecom has confirmed a data breach affecting 6.4 million customers, with personal information exposed during a cyberattack on August 4, 2025. The company has reported that no credit card numbers or account passwords were compromised, but customer data including contact details, contract information, civil status data, company details, and International Bank Account Numbers (IBANs) were stolen. Bouygues Telecom has taken measures to block the attacker’s access and enhance security monitoring.

Who’s affected

Approximately 6.4 million customers of Bouygues Telecom are impacted by the breach, which includes both individual and business accounts. Customers are at increased risk of fraud and phishing attempts due to the exposure of their personal data.

What to do

• Customers should be vigilant against phishing attempts and avoid sharing sensitive information over the phone or online.
• Regularly monitor bank statements for any suspicious activity, especially regarding debits related to the leaked IBANs.
• Contact your bank immediately if any unusual transactions are detected.

Sources

• BleepingComputer