Critical Microsoft Teams Vulnerabilities Expose Users to Message and Notification Manipulation
Check Point Research revealed four critical security flaws in Microsoft Teams that threaten the integrity of a major communication platform used by 320 million monthly active users worldwide. These vulnerabilities allow both outside attackers and malicious insiders to impersonate executives, alter messages undetectably, spoof notifications, and fake caller identities during video and audio calls.
How Attackers Exploit Microsoft Teams
The research team showed that attackers could manipulate core Teams messaging and calling features via various attack paths. By adjusting certain technical parameters within the platform, hackers can convincingly impersonate trusted colleagues and top leadership figures, leveraging the natural urgency often linked with messages from executives.
Key Exploitation Techniques
- Editing messages without leaving any audit trail by tampering with the
clientmessageidparameter. - Spoofing notifications to mislead users about the message's origin or legitimacy.
- Faking identities during calls to impersonate authorized employees or executives.
These flaws could fundamentally shake organizational security by enabling attackers to forge trusted communications and bypass detection.
The vulnerabilities uncovered point to advanced exploitation methods that, if leveraged, could cause severe disruptions and trust breakdowns in business communications across global organizations.
Summary
Microsoft Teams security flaws uncovered by Check Point allow hackers to impersonate executives and alter messages without detection, seriously risking organizational trust and communication integrity.