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Microsoft Teams Guest Access Exposes a Cross-Tenant Security Gap, Allowing Attackers To Slip Past Defender Protections

vm_adminNovember 29, 2025

By LinkedInEditors Publication Date: 2025-11-29 18:28:00 A newly documented security gap in Microsoft Teams’ guest access architecture is raising alarms…

Microsoft

Microsoft Teams’ guest chat feature exposes cross-tenant blind spot

vm_adminNovember 27, 2025

By Shweta Sharma Publication Date: 2025-11-27 06:01:00 A newly highlighted flaw in Microsoft’s cross-tenant collaboration model shows that once a…