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French Banks Reverse Erroneous Charges After Crédit Mutuel Arkéa Glitch

A technical replay of past card payments triggered duplicate debits, with customers told to wait for automatic refunds.

Overview

  • Since January 27, clients at Caisse d’Épargne, Banque Populaire, Boursorama and Crédit Coopératif reported unexpected or duplicated debits.
  • Crédit Mutuel Arkéa was identified as the source of the incident and says it has detected about 98% of the duplicate operations, with recredits rolling out over the coming days.
  • Affected banks launched automatic cancellations and asked customers not to file disputes, pledging no fees or financial loss.
  • The total number of impacted customers and amounts involved remain unclear, though reports indicate thousands of cases.
  • Some duplicate transactions are linked to Vinted purchases with refunds in process, and several banks indicated a return to normal by Friday.