Critical Microsoft Teams Flaw Lets Hackers Manipulate Messages and Notifications
Check Point Research has identified four critical security vulnerabilities in Microsoft Teams that threaten the integrity of one of the most popular communication platforms globally. These issues affect both external attackers and malicious insiders.
The flaws allow attackers to impersonate executives, alter messages without detection, spoof notifications, and forge caller identities during video and audio calls. With over 320 million monthly active users relying on Teams for business communications, these vulnerabilities present a serious risk to organizations worldwide.
Exploiting Core Messaging and Calling Functions
The research demonstrated how attackers could exploit Teams’ messaging and calling capabilities by manipulating certain parameters within its architecture. This enables the creation of convincing impersonations of trusted colleagues and senior leaders, leveraging the urgency often associated with executive communications.
Check Point Research explains: "Attackers discovered they could edit messages without leaving any audit trail by manipulating the clientmessageid parameter, making malicious content appear as legitimate communications from trusted sources."
Impact on Organizational Security
The vulnerabilities expose organizations to sophisticated attacks that undermine trust and security. By exploiting these flaws, threat actors can execute harmful actions while appearing completely legitimate, significantly increasing the risk of social engineering and other cyber threats.
Ensuring the security of communication platforms like Microsoft Teams is essential to protect sensitive business information and maintain operational integrity.
Author’s summary: Check Point Research reveals critical Microsoft Teams vulnerabilities that allow undetectable message edits and impersonations, posing severe risks to global business communications.