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November 2025 Page 9

November 2025

MS Teams Guest Access Can Remove Defender Protection When Users Join External Tenants

MS Teams Guest Access Can Remove Defender Protection When Users Join External Tenants

Nov 28, 2025Ravie LakshmananEmail Security / Enterprise Security Cybersecurity researchers have shed light on a cross-tenant blind spot that allows attackers to bypass Microsoft Defender for Office 365 protections via the guest access feature in…