Pro-Iran hackers disrupt medtech giant Stryker, wiping devices and stealing terabytes of data in a major cyberattack impacting global operations. Today's CXO Daily Cybersecurity Briefing also examines BeyondTrust vulnerabilities exploited in hospital ransomware campaigns, state-backed hackers targeting WhatsApp and Signal accounts of government officials, and a report showing half of U.S. school districts suffered cyber incidents in 2025. Plus: Microsoft Patch Tuesday fixes 84 vulnerabilities including two zero-days, a critical pac4j Java security flaw emerges, and Google warns of rapidly evolving AI-driven malware reshaping the threat landscape.