Critical Microsoft Teams Flaw Lets Hackers Manipulate Messages and Notifications
Check Point Research identified four serious security vulnerabilities in Microsoft Teams, a platform used by 320 million monthly active users worldwide for business communication. These flaws undermine trust by allowing both external hackers and malicious insiders to impersonate executives, alter messages undetected, spoof notifications, and fake caller identities during video and audio calls.
The research demonstrated multiple attack methods that exploit Microsoft Teams' core messaging and calling features. By tampering with specific parameters in the platform’s architecture, attackers can create highly convincing impersonations of trusted colleagues and leaders, exploiting the urgency that often accompanies messages from senior management.
These vulnerabilities enable attackers to “edit messages without leaving any audit trail by manipulating the clientmessageid parameter,” making harmful content appear as legitimate communication from trusted sources.
The sophisticated exploitation techniques revealed by Check Point highlight a significant global risk to organizations relying on Microsoft Teams for secure communication.
Author’s Summary
These critical vulnerabilities in Microsoft Teams allow attackers to impersonate leaders and alter messages undetected, posing a major threat to organizational security worldwide.
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