In today’s cybersecurity roundup: Microsoft investigates login issues caused by recent Windows updates, while Japanese retailer Muji halts online sales after a ransomware attack. Experts uncover a prompt-injection flaw in Microsoft 365 Copilot, and the NYDFS issues new guidance on third-party cyber risks. Plus, critical vulnerabilities emerge in the Better-Auth library, a new PolarEdge botnet targets routers, and Meta rolls out AI-powered tools to combat scams across its messaging platforms.