McDonald's AI-powered hiring chatbot, known as "Olivia," which is used by over 90% of McDonald's franchises for job applications, exposed the personal data of approximately 64 million applicants due to basic security flaws. The vulnerability was exploited by hackers who accessed the system using the simple and commonly used password "123456." The chatbot operates on the McHire platform, developed by an AI software firm, and the breach potentially exposed millions of chat records containing names, emails, phone numbers, and interview details. Security researchers discovered the flaw, which allowed access to the extensive database without sophisticated hacking techniques. McDonald's has acknowledged responsibility for the security lapse but stated there was no public data leak. This incident highlights concerns about the security of automated recruitment systems and the risks associated with weak password protection in AI-driven hiring tools.