Local Privilege Escalation Vulnerability in TeamViewer Client Across Multiple Platforms

CVE-2026-19743

What is CVE-2026-19743?

CVE-2026-19743 is a local privilege escalation vulnerability found in the TeamViewer Full Client and Host applications across multiple operating systems, including Windows, Linux, and macOS. This vulnerability stems from improper path validation within the local inter-process communication (IPC) service. It allows a local authenticated user, who has low privileges, to manipulate file paths by sending specially crafted IPC commands to the local service daemon. This manipulation can enable the attacker to perform arbitrary file writes with elevated privileges, potentially allowing them to execute commands as a system-level user (NT AUTHORITY/SYSTEM or root). This poses significant risks to organizations, as it can compromise the integrity and security of critical system components and sensitive data.

Potential impact of CVE-2026-19743

1. Unauthorized Access and Control: The vulnerability can enable a low-privileged user to escalate their privileges to a system-level account, granting them extensive control over the affected system. This may lead to unauthorized access to confidential information and critical system resources.

2. Data Integrity and Confidentiality Breach: With the ability to perform arbitrary file writes, an attacker could modify, delete, or exfiltrate sensitive data. This could result in not only data loss but potentially also compliance violations, especially in industries that are governed by strict data protection regulations.

3. Potential for Malware Deployment: Exploiting this vulnerability could provide an attacker with the means to install malware or backdoors on the compromised system, facilitating further exploitation, lateral movement within the network, and the potential for larger-scale attacks. This creates a heightened risk for organizations, particularly those relying on TeamViewer for remote access solutions.

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