Microsoft has announced significant security enhancements for Teams, introducing robust protections against malicious file types and dangerous URLs. In a dual-pronged update, Microsoft will automatically block potentially dangerous executables and warn users about malicious URLs in chats and channels. The security update marks a shift in how Microsoft Teams handles potential threats, implementing automated detection and blocking mechanisms at the platform level. Microsoft’s roadmap entries 499892 and 499893 detail that Teams will now scan both file attachments and embedded URLs for malicious content before they reach users. Files containing executables can, once clicked, instruct a computer or platform to run a certain program, potentially downloading malware or Trojans. URLs can lead users to sites that deliver malware to their computers. This proactive approach minimizes the human factor that has made Teams users vulnerable to social engineering attacks, where legitimate-looking attachments or URLs contain malicious payloads designed to compromise corporate networks. Additionally, Microsoft announced in the Microsoft 365 Message Center that Teams now integrates with the Microsoft Defender for Office 365 Tenant Allow/Block List. This enables security administrators to block incoming communications (chats, channels, meetings, and calls) from blocked domains, automatically delete existing communications from users in blocked domains, and manage blocked external domains in Microsoft Teams via the Microsoft Defender portal. Such control eliminates the ability for malicious files or URLs to remain within a system long after they are identified.