In response to a series of unauthorized ATM withdrawals, Citibank has reissued an unspecified number of debit and credit cards, the Channel Register reports.Citibank also blocked PIN-based transactions of its branded MasterCards in the U.K., Russia and Canada to stop any further fraudulent withdrawals, according to the Channel Register.The troubles at Citibank were first revealed when a blogger with the popular blog site Boing Boing reported that he had experienced some complications using a Citibank card at an ATM in Canada, leading him to begin investigating the issue, the Channel Register reports.According to SecurityFocus, Citibank issued the following release in response to inquiries regarding the breach: “Recently, we became aware of fraudulent ATM cash withdrawals on Citi-branded MasterCard credit and debit cards used in the UK, Russia and Canada on customer accounts that had been possibly compromised in previous retailer breaches in the U.S. To protect customer accounts that were affected, we placed a special transaction block in those three countries on PIN based transactions. We are currently reissuing cards, as appropriate, to affected customers.“Protecting our customers’ accounts and personal information is one of our highest priorities.” For related CSO content, read When the Dike Breaks: Responding to the Inevitable Data Breach.For related news coverage, read Ore. Health Data Breach Results in Loss of 4 Jobs and McAfee Employee Data Lost by Auditor.Keep checking in at our CSO Security Feed page for updated news coverage. Related content news Okta launches Cybersecurity Workforce Development Initiative New philanthropic and educational grants aim to advance inclusive pathways into cybersecurity and technology careers. By Michael Hill Oct 04, 2023 3 mins IT Skills Careers Security news New critical AI vulnerabilities in TorchServe put thousands of AI models at risk The vulnerabilities can completely compromise the AI infrastructure of the world’s biggest businesses, Oligo Security said. By Shweta Sharma Oct 04, 2023 4 mins Vulnerabilities news ChatGPT “not a reliable” tool for detecting vulnerabilities in developed code NCC Group report claims machine learning models show strong promise in detecting novel zero-day attacks. By Michael Hill Oct 04, 2023 3 mins DevSecOps Generative AI Vulnerabilities news Google Chrome zero-day jumps onto CISA's known vulnerability list A serious security flaw in Google Chrome, which was discovered under active exploitation in the wild, is a new addition to the Cybersecurity and Infrastructure Agency’s Known Exploited vulnerabilities catalog. By Jon Gold Oct 03, 2023 3 mins Zero-day vulnerability Podcasts Videos Resources Events SUBSCRIBE TO OUR NEWSLETTER From our editors straight to your inbox Get started by entering your email address below. Please enter a valid email address Subscribe