French Bank Crédit Mutuel Arkéa Suffers Over 100 Million Euros in Cyberattack

Key summary

Crédit Mutuel Arkéa, a French cooperative banking group headquartered in Brittany, announced that it was the victim of a cyberattack resulting in a loss of approximately 100 million euros, or about 112.6 million U.S. dollars (3.8 billion Thai baht), on Wednesday, November 4th. Hackers used the bank's accounts to conduct illegal money transfers to other banks, and then laundered the funds through cryptocurrencies. The bank confirmed that the stolen funds were not initially in the form of cryptocurrency but were converted later. The bank also denied rumors that Fortuneo, an online banking business within the group, was involved in the attack. The Paris prosecutor's office immediately launched an investigation, assigning it to the French cybercrime police, who have not yet disclosed the names of the external service providers used in the attack. A report from Radware indicated that Web DDoS attacks increased by 110.6% and dangerous transactions against Web Applications/APIs increased by 104% in the first half of 2026 compared to 2025.