CVE-2026-20987

Vulnerability

Overview

CVE-2026-20987 is an improper input validation vulnerability in Samsung's GalaxyDiagnostics application prior to version [1]. The flaw exists in versions prior to 3.5.050, where the application fails to properly validate input from a local privileged user, enabling command injection or similar attacks that lead to execution of privileged commands.

Exploitation

Prerequisites

Exploitation requires local access to the device with elevated privileges (e.g., root or system-level access). The attacker must be able to interact with the GalaxyDiagnostics component, which is typically used for device diagnostics and maintenance. No network-based exploitation is not possible; the attack vector is strictly local.

Impact

A successful attack allows a local privileged attacker to execute arbitrary commands with higher privileges than already held, potentially leading to full device compromise, persistent backdoor installation, or bypass of security controls. The impact is limited to devices where GalaxyDiagnostics is installed and accessible to the attacker.

Mitigation

Samsung has addressed this vulnerability in GalaxyDiagnostics version 3.5.050 and later. Users should update the application to the latest version available through Samsung's update mechanisms. No workarounds have been published; the only mitigation is applying the patch.