Related Threat Clusters

Microsoft Defender Introduces Automatic Isolation for Compromised Devices
Microsoft has launched a new feature in Defender for Endpoint that automatically isolates compromised devices to prevent lateral movement by attackers. This capability, currently in preview, disconnects affected…

13 articles · Updated May 26, 2026
Microsoft Teams Guest Access Vulnerability Exposes Users to Security Risks
A report from Ontinue reveals that Microsoft Teams' guest access feature allows users to accept invitations from external organizations, which results in the loss of their Defender for Office 365 protections. This…

23 articles · Updated November 28, 2025
Critical Vulnerabilities in Microsoft Teams Enable Message Manipulation and Impersonation
Check Point Research identified four critical vulnerabilities in Microsoft Teams that allowed attackers to manipulate messages, spoof notifications, and impersonate executives. Both external hackers and malicious…

7 articles · Updated November 5, 2025

Recent Intelligence Reports

Microsoft previews automatic device isolation in Defender for Endpoint — Csoonline · May 27, 2026
Using Teams' Guest Access feature? You're opening a security hole — Computing · November 28, 2025
Microsoft Teams Flaw in Guest Chat Exposes Users to Malware Attacks — Hackread · November 26, 2025