<h2 id="header-0">Key Facts</h2>
<ul>
 <li>Crédit Mutuel Arkéa said on Wednesday it was the target of a cyberattack that enabled fraudulent transactions, and that the incident has been contained and operations are gradually resuming.</li>
 <li>The French cooperative bank said customers' assets were not affected and that the amounts involved, still being assessed, will not undermine its financial strength.</li>
 <li>ZachXBT alleged early Wednesday UTC that the bank was the victim of a $133 million-plus theft he traced through crypto exchange withdrawals; the bank's statement does not mention crypto or a figure.</li>
</ul>
French bank Crédit Mutuel Arkéa said it was hit by a cyberattack that enabled fraudulent transactions. Earlier that day, onchain investigator ZachXBT alleged it was the victim of a $133 million-plus theft he has been tracing through crypto exchanges.
The bank said the incident has been contained, operations are gradually resuming and customers' assets were not affected. Its statement did not mention crypto, ZachXBT or the size of the loss.
"Crédit Mutuel Arkéa announces that it has been the target of a cyberattack that enabled fraudulent transactions to be carried out," the group said in a <a target="_blank" rel="noopener noreferrer nofollow" href="https://www.actusnews.com/fr/credit-mutuel-arkea/cp/2026/11/04/credit-mutuel-arkea-announces-it-has-been-the-target-of-a-cyberattack">statement</a> on Wednesday.<img src="https://academy-public.coinmarketcap.com/optimized-uploads/514a218e91b644b8ba5dd2522e78f644.png">
Crédit Mutuel Arkéa said a cyberattack enabled fraudulent transactions but did not affect customers' assets. Source: <a target="_blank" rel="noopener noreferrer nofollow" href="https://www.arkea.com">Crédit Mutuel Arkéa</a>
<h2 id="header-1">What Crédit Mutuel Arkéa Said</h2>
After detecting the attack, the group informed the relevant authorities and supervisory bodies and temporarily suspended certain transactions to prevent further fraudulent movements, it said. For customers, the incident only delayed the execution of some transfers, according to the bank.
The amounts affected are still being assessed but are "in any event not of a nature to undermine the Group's financial strength and soundness," the bank said. It warned customers that <a target="_blank" rel="noopener noreferrer nofollow" href="https://coinmarketcap.com/academy/glossary/phishing">phishing</a> attempts are possible following the attack.
Crédit Mutuel Arkéa is a cooperative group that includes Crédit Mutuel de Bretagne, Crédit Mutuel du Sud-Ouest and subsidiaries such as Fortuneo. It reports total assets of €211.5 billion and more than 5.8 million members and customers.
<h2 id="header-2">What ZachXBT Alleged About the Bank</h2>
ZachXBT first flagged the incident on Monday, saying an unnamed EU entity was <a target="_blank" rel="noopener noreferrer nofollow" href="https://coinmarketcap.com/academy/article/zachxbt-eu-entity-106m-exchange-accounts-theft">suspected of losing more than $106 million</a> from several <a target="_blank" rel="noopener noreferrer nofollow" href="https://coinmarketcap.com/academy/glossary/centralized-exchange-cex">centralized exchange</a> accounts on Nov. 1. On Tuesday, he <a target="_blank" rel="noopener noreferrer nofollow" href="https://coinmarketcap.com/academy/article/zachxbt-eu-theft-133m-western-europe-institution">raised his estimate to more than $133 million</a>.
"Disclosing the EU financial institution exploited for $133M+ is allegedly Credit Mutuel Arkea, a French bank with $235B in assets," he wrote in an <a target="_blank" rel="noopener noreferrer nofollow" href="https://t.me/investigations/375">update</a> on his Telegram channel early Wednesday UTC. He said the attack ran for multiple days and that he suspects the amount stolen is larger when over-the-counter activity is included.
Crédit Mutuel Arkéa has not confirmed ZachXBT's figures or said whether the fraudulent transactions involved crypto. The bank said its teams are still assessing the consequences of the <a target="_blank" rel="noopener noreferrer nofollow" href="https://coinmarketcap.com/academy/glossary/hacking">cyberattack</a> and will provide updates as new information becomes available.
Read More:&nbsp;<a target="_blank" rel="noopener noreferrer nofollow" href="https://coinmarketcap.com/academy/article/uk-ncsc-ai-ransomware-warning-crypto-payments">UK Warns of AI Ransomware Risk as Crypto Payouts Fall</a>

Crédit Mutuel Arkéa Discloses Cyberattack as ZachXBT Alleges $133M Theft

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