Razer Synapse Security Flaw Exposes Millions of Gaming PC Users

By Kim Njuki April 29, 2025 Updated: October 17, 2026 3 min read

Razer Synapse, the peripheral management software used by millions of PC gamers to configure Razer mice, keyboards, and headsets, has a local privilege escalation vulnerability that was publicly disclosed in April 2026. The vulnerability was discovered by security researcher Marcus Webb and coordinated with Razer's security team before publication.

What the Vulnerability Does

The flaw is a local privilege escalation (LPE) — meaning an attacker needs to already have limited access to your PC to exploit it, but the exploit elevates that limited access to SYSTEM-level privileges, the highest level on a Windows machine.

In practice, the attack scenario looks like this: malware infects a PC with standard user-level access. Without Synapse, the malware is constrained to what that user account can do. With the Synapse vulnerability, the malware can exploit the flaw to gain SYSTEM access, allowing it to disable antivirus, read password manager local databases, modify system files, and persist even after a user password change.

The vulnerability exists in how Synapse handles a specific Windows service that runs with SYSTEM privileges. By manipulating the arguments passed to that service through a specific sequence of API calls, a user-mode process can cause it to execute arbitrary code in SYSTEM context.

Who Is Affected

Any Windows user running Razer Synapse versions prior to the patched release is affected. Razer Synapse is installed on an estimated 35-40 million PCs worldwide, making the exposure significant even accounting for the "local access required" prerequisite.

The vulnerability does not affect macOS Razer software.

The Fix: Update Synapse Immediately

Razer released a patched version of Synapse (4.4.2.7 and later) that remediates the privilege escalation path. Update through Synapse's built-in update mechanism:

1. Open Razer Synapse
2. Click your account avatar or the settings gear
3. Navigate to "About" or "Updates"
4. Install any pending updates and restart Synapse

Alternatively, download the latest Synapse installer directly from razer.com/synapse and run it over the existing installation.

Verify your installed version after updating. The About screen should show 4.4.2.7 or later. Earlier versions remain vulnerable.

If You Don't Use Synapse Actively

Many PC gamers install Synapse when they first set up a Razer peripheral and then forget it's running. If your Razer device works adequately without Synapse (mice and keyboards typically function as standard HID devices without it), and you don't use Synapse's customization features, consider uninstalling it entirely. A software vulnerability in software you don't need is an unnecessary attack surface.

Go to Settings > Apps > Razer Synapse and uninstall. Your Razer peripherals will continue to function with their stored onboard memory configuration (if the device supports onboard memory).

Context: Peripheral Software as Attack Surface

This is not the first LPE in Razer Synapse and is not unique to Razer — similar vulnerabilities have been documented in Corsair iCUE, ASUS Armoury Crate, and Logitech G HUB over the past few years. Peripheral management software consistently runs privileged services to enable its hardware-level access features, creating a recurring LPE attack surface class.

The systemic lesson: keep all peripheral management software updated, and remove it entirely if you don't actively use its features. The convenience cost of uninstalling is low. The security cost of a known LPE running on 35 million PCs is not.