CVE-2026-92375 in Full Client
Summary
by MITRE • 10/27/2026
An improper access control vulnerability in the IPC communication between TeamViewer Full Client or Host prior to version 15.83 and the Remote Management Monitoring component prior to version 26.10.1 allows a local authenticated attacker with low privileges to execute scripts as SYSTEM/root.
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Analysis
by VulDB Data Team • 10/27/2026
The identified security flaw resides within the Inter-Process Communication (IPC) mechanisms utilized by TeamViewer software, specifically affecting versions of the Full Client and Host prior to 15.83 and the Remote Management Monitoring component prior to version 26.10.1. This vulnerability stems from an improper implementation of access control checks during local IPC interactions between these components. In a typical secure architecture, processes operating with elevated privileges must rigorously validate the identity and permissions of any requesting process before executing sensitive operations or granting access to protected resources. However, in this specific scenario, the validation logic is insufficient, allowing a lower-privileged entity to bypass expected restrictions when communicating with higher-privilege components.
From a technical perspective, the core issue involves a privilege escalation vector where an attacker who has already gained local authenticated access on the target system can exploit weak IPC permissions. The vulnerability allows such an actor, even if they possess only low-level user privileges, to send crafted requests or commands through the IPC channel that are then executed by the TeamViewer components running with SYSTEM or root level privileges. This effectively bypasses standard operating system security boundaries because the elevated process trusts the input from a less privileged source without adequate verification of its authority to perform such actions. The flaw is particularly dangerous as it does not require physical access or complex exploitation techniques beyond having valid local credentials, which are often easier for attackers to obtain through phishing, credential stuffing, or other initial compromise methods.
The operational impact of this vulnerability is severe due to the resulting privilege escalation. By executing scripts with SYSTEM on Windows or root on Linux environments, an attacker gains complete control over the affected machine. This level of access allows for the installation of persistent backdoors, exfiltration of sensitive data stored locally, modification of system configurations, and further lateral movement within a network environment. Since TeamViewer is frequently used in enterprise settings to manage remote systems, compromising these components can lead to widespread organizational impact if multiple endpoints are affected simultaneously or if an attacker uses the compromised machine as a pivot point for deeper intrusion.
This vulnerability aligns with Common Weakness Enumeration (CWE) category CWE-269, which covers Improper Privilege Management, and more specifically relates to issues where access control decisions are not enforced correctly during inter-process communication. In terms of adversary tactics, this exploitation path corresponds to the ATT&CK technique T1053 Scheduled Task/Job, as it involves executing commands with elevated privileges, often through system-level processes that can be manipulated or abused by lower-privileged users. It also touches upon lateral movement capabilities if the compromised host is used to attack other systems via TeamViewer's remote management features.
To mitigate this risk, organizations must prioritize immediate patching of all affected TeamViewer components. Administrators should upgrade the Full Client and Host software to version 15.83 or later and ensure that Remote Management Monitoring is updated to version 26.10.1 or newer. These updates contain the necessary fixes for the IPC access control logic, ensuring that privilege boundaries are correctly enforced during local communications. Additionally, implementing strict application whitelisting policies can help prevent unauthorized scripts from executing even if an attacker gains initial low-privileged access. Regular audits of installed software versions and enforcing least-privilege principles across all user accounts further reduce the attack surface available to potential adversaries seeking to exploit such vulnerabilities.