Bouygues Telecom Hit by Cyberattack, 6.4 Million Customers Affected

A cyberattack on Bouygues Telecom exposed data for 6.4 million customers. Find out what information was compromised and what you need to do to protect yourself from scams, as the company warns customers to be on high alert.

French telecommunications giant Bouygues Telecom has confirmed a cyberattack that resulted in the personal information of 6.4 million customers being exposed. The company, which serves nearly 27 million mobile users across France, discovered the security breach on August 4th.

An investigation by the company revealed that hackers gained access to a variety of customer details. This includes contact information, contract details, and, for many, their International Bank Account Number (IBAN). An IBAN is a unique number that identifies a bank account and is used to process transactions like direct deposits or transfers.

Bouygues has confirmed that more sensitive data, like passwords and credit card numbers, were not affected in this breach. Both individual and business customers were impacted by the attack. The company promptly reported the incident to French authorities and is alerting all affected customers via email or text message.

In response to the breach, Bouygues is urging its customers to be extremely cautious of potential scams. Customers should watch for any suspicious emails or phone calls from people pretending to be from Bouygues or another company, as scammers might use the stolen data to try and trick them into revealing more information, such as credit card numbers or passwords.

Bouygues also advised customers whose IBANs were exposed to monitor their bank accounts closely and contact their bank if they notice any unusual activity. The company has filed a complaint with judicial authorities, noting that the perpetrator could face up to five years in prison and a €150,000 fine.

The attack on Bouygues is part of a broader trend of major telecommunication firms being targeted globally. As reported by Hackread.com, in May 2025, South Korean firm SK Telecom revealed a malware intrusion that had gone undetected for nearly two years, leaking vast amounts of customer data.

Furthermore, an advisory from the FBI and Canada’s Cyber Centre in June 2025 warned of an ongoing cyber espionage campaign by a China-linked group called Salt Typhoon, which is actively targeting telecom networks worldwide to steal sensitive data. These incidents highlight why telecommunications companies, due to the valuable data they hold, are frequent targets for both cybercriminals and state-sponsored groups.