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Critical Vulnerabilities in Microsoft Teams Enable Message Manipulation and Impersonation

First seen 23 Nov 2025, 03:35 UTC • Techrepublic

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ThreatCluster

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 insiders were able to exploit these flaws, which have since been patched, posing significant risks to communication integrity within organizations.

How this analysis works

Attack Flow

8 entities, 8 inferred relationships (STIX 2.1).

Technique (4)

Data Breach
Malware
Phishing
T1566 - Phishing

Affected Platform (1)

Defender For Office 365

Tool (1)

Microsoft Teams

Vulnerability (2)

Microsoft Teams Guest Chat Flaw
Microsoft Teams Guest Chat Vulnerability

Relationships

Microsoft Teams exploits Microsoft Teams Guest Chat Flaw
Microsoft Teams exploits Microsoft Teams Guest Chat Vulnerability
Microsoft Teams Guest Chat Flaw targets Defender For Office 365
Microsoft Teams Guest Chat Vulnerability targets Defender For Office 365
Data Breach targets Defender For Office 365
Malware targets Defender For Office 365
Phishing targets Defender For Office 365
T1566 - Phishing targets Defender For Office 365

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Microsoft Defender Introduces Automatic Isolation for Compromised Devices Microsoft Teams Guest Access Vulnerability Exposes Users to Security Risks

Critical Vulnerabilities in Microsoft Teams Enable Message Manipulation and Impersonation

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Extracted Entities

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