The Data Extraction Exploit
Google Chrome supports the Clipboard API, which allows websites to automatically interact with your operating system’s copy/paste buffer. While useful for web-based text editors, granting a website the ability to automatically read your clipboard is a massive privacy vulnerability. If you just copied a password from your password manager, or copied a secure banking routing number, a malicious website could theoretically execute a hidden script to instantly read and steal that data the second you load the page. To secure your local data, you must completely paralyze this read-access API.
How to Block Clipboard Read Access Globally
You can permanently sever the browser’s ability to pull data from your clipboard via Chrome’s Site Settings.
- Open the Google Chrome desktop browser.
- Click the three vertical dots (⋮) in the top right corner and select Settings.
- In the left-hand sidebar, click on Privacy and security.
- In the main window, click on Site settings.
- Scroll down to the “Permissions” heading and click to expand Additional permissions.
- Click on Clipboard.
- Under the “Default behavior” heading, select the radio button for “Don’t allow sites to see text or images on your clipboard.”
Secured Memory Buffers
The change takes effect instantly. Google Chrome will completely sever its internal read connection to your operating system’s clipboard daemon. If a website attempts to execute an automated script to silently pull the text you just copied, the API call will instantly auto-reject in the background, returning a null value. You can still manually paste data into text boxes using Ctrl+V, but websites are permanently barred from automatically extracting data on their own, guaranteeing absolute privacy for your sensitive copied information.