French cooperative bank Crédit Mutuel Arkéa is assessing the financial impact of a cyberattack that allowed fraudulent transactions to take place. The bank confirmed the incident on Wednesday (November 4, 2026), but said customers' money and assets had not been affected.
The financial institution said the attack had been contained and that normal operations were gradually resuming. It has not disclosed the exact amount involved, adding that the losses are still being evaluated and would not threaten the group's financial stability.
Crédit Mutuel Arkéa noted that their security team identified the incident and notified all the necessary authorities and supervisors right away. The bank took precautionary steps and stopped certain transactions to avoid any further fraudulent activity and protect itself.
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The bank's decision to stop the transactions affected some transfers; however, there would be no monetary loss to the clients because operations are now getting back to the normal state after implementing necessary measures. The bank is yet to give detailed information on the way hackers were able to enter and perform the fraudulent transactions.
The scale of the incident remains unclear. French regional newspaper Le Télégramme reported that around EUR 118 million, equivalent to approximately USD 133 million, had been stolen. However, Crédit Mutuel Arkéa has not confirmed this figure. The bank said it was still calculating the amount affected by the attack.
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Blockchain investigator ZachXBT reportedly brought the incident to public attention. Reports suggest that the funds may have been moved through multiple accounts associated with cryptocurrency exchanges. These details have not been fully confirmed by the bank.
Crédit Mutuel Arkéa serves around 5.8 million customers and reported total assets of EUR 211.5 billion. The group operates across Brittany and southwestern France through regional banking federations and approximately 40 subsidiaries.