In brief: TeamViewer users on macOS must expect that attackers may be able to bypass their 2FA protection measures under certain conditions and gain remote access.
A security vulnerability in TeamViewer allows two-factor authentication to be bypassed under certain conditions on macOS. Attackers can thus establish unauthorized remote sessions.
A vulnerability has been identified in TeamViewer on macOS that allows attackers under certain circumstances to establish a remote session without undergoing the enabled two-factor authentication.
For security managers, this is a critical aspect when assessing TeamViewer’s deployment within their own organization, particularly when macOS systems are used to manage enterprise infrastructure or as endpoints in the IT environment. The vulnerability highlights risks inherent in the assumption that multi-factor authentication provides absolute security as long as not all operating systems are implemented with the same level of security.
CISOs should first check which macOS-based systems use TeamViewer and how critical access to them is. Depending on available patch information and the frequency of such conditions, it should be considered to restrict usage or switch to alternative remote management solutions until a fix is available.
Source: www.heise.de · Published 29 July 2026
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