Just a few days ago, it looked like another in a series of security issues that Apple solved by updating macOS. Now, however, the situation is much more serious. According to new information, a security flaw in the popular Screen Sharing feature is being actively exploited by attackers. So if you still haven't updated your Mac, I definitely wouldn't wait any longer.
You might be interested in
Apple however, the patch was released on August 6th for three currently supported versions of the system. Specifically, it concerns macOS Tahoe 26.6.1, macOS Sequoia 15.7.9, and macOS Sonoma 14.8.9In the first notes Apple It only stated that the updates brought important security fixes. However, the company later released details and it turned out that one of the bugs fixed was related to Screen Sharing.
ProThe bug is marked as CVE-2026-65400 and its nature is quite unpleasant. According to the Applu could bypass normal authentication and log in to Screen Sharing without valid credentials. In other words, he could gain remote access to the Mac without knowing the user's password. And with Screen Sharing, this is a much bigger problem than a common system bug. If an attacker gains access to this feature, they can, depending on the computer's configuration, see the screen, open applications and files, and perform other operations that would otherwise require physical access to the Mac.
Gallery
ProThe problem is no longer just theoretical.
Even when the patch is released Apple stated that it had no information that the flaw was being actively exploited. But that has now changed. The Dutch National Cyber Security Center, according to 9to5Mac received information about active exploitation of this flaw on several systems where port 5900 was accessible directly from the Internet. Perhaps even more disturbingly, in these cases, the attackers managed to gain root access to the compromised computers. They then installed the cryptocurrency miner M.onero, so they used their power for their own mining.
So, according to the available information, current attacks are not primarily aimed at stealing photos or passwords, for example. But that certainly doesn't mean the situation is harmless. Once an attacker has sufficient permissions on a Mac, they can potentially perform a variety of other malicious actions.
Apple therefore, it has released a fix for all three supported generations of macOS. So if you're using macOS Tahoe, Sequoia, or Sonoma, check General → Software Update in System Preferences to make sure you have the latest version installed. It's also a good idea to check if you really need Screen Sharing. If you don't use it, you can turn it off in System Preferences via General → Sharing → Screen Sharing. Mac owners who have Screen Sharing available from the Internet should pay special attention. According to available information, it is these computers that are currently being attacked.
You might be interested in
So if you were still putting off last week's update, there's really nothing to wait for this time. Apple Although it fixed the bug, given that its exploitation has already been recorded in practice, updating your Mac is currently one of the best things you can do to ensure its security.
