Hackers Can Seize Control of Your Mac via Screen Sharing — Apple Fixes Critical Flaw

Mac users who have not installed the latest security updates for their operating system could be at risk of a serious vulnerability in the Screen Sharing feature. According to researchers from the Netherlands, the exploit has already been used in online attacks aimed at cryptocurrency mining.

Apple has addressed the issue with security updates for its three most recent macOS versions: Sonoma 14.8.9, Sequoia 15.7.9, and Tahoe 26.6.1. If you haven't upgraded to these versions, your system may be exposed to a loss of control through the Screen Sharing function, which allows you to wirelessly mirror or extend your Mac's desktop to a TV, tablet, or other device.

According to Apple's update documentation, the vulnerability could allow an attacker on the network to authenticate to Screen Sharing without valid credentials. This means not only viewing your screen, but also accessing files, spying on private chats, and even taking control of your keyboard, mouse, or trackpad. The attack can occur while Screen Sharing is actively in use, or if it is left enabled without disconnecting.

To protect your system, you can turn off Screen Sharing or check who has access to your Mac's screen in the macOS system settings under General, then Sharing. The updates are available through the Software Update section in System Settings.

The vulnerability highlights the risks of leaving remote access features enabled, especially on networks that may not be fully secure. Users are strongly advised to install the latest updates immediately to prevent potential data breaches or unauthorized control of their devices. A representative for Apple did not immediately respond to a request for comment.