ChromeOS 16667.40.0 Security Issue: How to Fix

First reported on chrome releases on June 12, 2026.

Some users are experiencing a security issue with ChromeOS 16667.40.0, which can allow hackers to take control of their computer. This issue is likely due to a vulnerability in the operating system. Users can try updating their ChromeOS, resetting their ChromeOS settings, or seeking help from a professional to resolve the issue.

What it looks like

• ChromeOS security issue

How to fix it

1. Restart your ChromeOS device.
2. Click on the time in the bottom right corner.
3. Click on Settings.
4. Click on About ChromeOS.
5. Check for updates and follow the prompts to update.

Affected products

• ChromeOS 16667.40.0

Sources

• Beta Channel Update for ChromeOS / ChromeOS Flex — rss:chrome_releases

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