French bank Credit Mutuel Arkea suffers major cyberattack

On November 4, 2026, the French bank Credit Mutuel Arkea reported that it had fallen victim to a cyberattack that facilitated fraudulent transactions. The incident, which was initially brought to light by crypto-security researcher ZachXBT, involves unauthorized access to an internal banking account utilized for interbank transfers. The bank, based in Brittany, officially confirmed that the situation is now under control and emphasized that no customer accounts were breached.

Estimates regarding the total financial loss vary across media sources. While the newspaper Le Telegramme reported damages near 133 million dollars (approximately 118 million euros), other reports, including information from Challenges, suggest the loss is closer to 100 million euros. The bank has not confirmed an exact figure for the total financial impact of the breach.

Authorities and the bank are currently managing the aftermath of the incident, which has caused significant concern within the French and European banking sectors. While the bank maintains that the event is limited and does not impact its customers' funds, an investigation into the suspicious fund transfers is reportedly underway to determine the extent of the security failure and the identities of the perpetrators.