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France, attack on the Post Office: hackers steal data from 22 million customers

Repubblica.It • November 14, 2026

Maileva, a subsidiary of the La Poste group specialising in business mail, was the victim of a serious cyberattack in mid-September, which led to the theft of the personal data of 22 million people. La Poste announced this yesterday to the AFP news agency. Maileva “has notified the Cnil”, the data protection authority, and has filed a complaint. “A judicial investigation is underway,” La Poste added, confirming reports from specialist websites FrenchBreaches and cyberattaque.org, which describe it as “one of the largest data breaches in France”. Maileva – which specialises in business correspondence for SMEs and medium-sized enterprises – has over 70,000 users and handled the dispatch of 180 million documents in 2024.

The attack “resulted in the exposure of personal data (first name, surname, postal address) of 22 million people, recipients of correspondence sent on behalf of Maileva’s corporate clients”, the La Poste group stated in a press release.

Last year, just a few days before Christmas, La Poste had already been hit by a cyberattack, claimed by pro-Russian hackers.

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Mass Data Breach at Maileva Exposes 22 Million Customers' Personal Information Maileva, a subsidiary of La Poste in France, confirmed a cyberattack in mid-September that resulted in the theft of personal data from 22 million individuals. The breach involved names, first names, and postal addresses of recipients whose mail was processed for corporate clients. La Poste reported the incident to the National Commission on Informatics and Liberty (CNIL) and has initiated a judicial investigation. The attack was detected on September 23, leading to a temporary service shutdown. Although the breach was not disclosed until November, it is considered one of the largest data breaches in France's history. Affected organizations include housing providers and health services, with notifications sent to impacted clients. As of now, there is no evidence that the stolen data has been publicly released or sold. 2 sources 60

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France, attack on the Post Office: hackers steal data from 22 million customers

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