- Apple has released macOS Tahoe 26.6.1 to fix a Screen Sharing security vulnerability.
- The flaw could allow authentication to Screen Sharing without valid credentials.
- macOS Sequoia 15.7.9 and macOS Sonoma 14.8.9 also include the security fix.
- Mac users can install the latest update through System Settings and Software Update.
Apple has released macOS Tahoe 26.6.1, a security update that addresses a serious vulnerability in the Mac operating system’s Screen Sharing feature. The flaw could allow an attacker to authenticate to a Screen Sharing session without having valid credentials, making the update particularly important for users who rely on remote access features.
The security issue affects more than just Macs running the latest version of Apple’s operating system. Apple has also released security updates for supported older versions of macOS, giving users who have not moved to Tahoe a way to protect their devices without upgrading to the newest major release.
Apple fixes Screen Sharing authentication flaw
According to Apple’s security information, the vulnerability is linked to the way Screen Sharing handles authentication. In a successful attack, an individual could potentially gain access to a Screen Sharing session without providing legitimate credentials.
Screen Sharing is designed to let users remotely view and control a Mac. It can be useful for accessing a computer from another location, helping someone troubleshoot a Mac, or managing a system remotely. Because the feature provides access to a Mac’s desktop, weaknesses in its authentication process can have serious consequences.
Apple says it has addressed the problem by improving state management. The company has not suggested that users should disable Screen Sharing permanently, but installing the security update is the most straightforward way for affected Mac owners to protect themselves.
Security updates like this are often less noticeable than major operating system releases because they do not necessarily introduce significant new features. However, they can be more important from a security perspective, particularly when they address vulnerabilities involving authentication.
Older Mac versions also receive the fix
Apple has not restricted the security fix to macOS Tahoe. The company has also released macOS Sequoia 15.7.9 and macOS Sonoma 14.8.9, which include the same Screen Sharing security correction.
This is significant for Mac owners who prefer to stay on an older supported version of macOS. Users do not need to move immediately to macOS Tahoe simply to receive this particular security protection.
Keeping an older supported version of macOS can be a practical choice for people who depend on specific applications, accessories or workflows that may not yet be fully compatible with a newer operating system. Apple’s decision to provide the security fix across multiple supported versions means those users can continue with their current setup while still receiving an important security improvement.
Mac owners should therefore check which version of macOS their device is running and install the latest update offered for that version.
How to install the latest macOS security update
Installing the update does not require downloading it from a separate website. Mac users can check for it directly through the System Settings app.
Open System Settings on the Mac and select Software Update. The system will check whether a newer version is available for the device. If the update appears, users can select the option to download and install it.
It is worth making sure important files are backed up before installing any operating system update. Users should also allow enough time for the installation process, as the Mac may need to restart before the update is completed.
For users who have Screen Sharing enabled, installing the latest available security update is especially advisable. Even users who do not regularly use the feature should keep their Mac updated, since security fixes can address vulnerabilities that may be exploited in different circumstances.
Apple’s latest release is therefore less about adding new functionality and more about closing a security gap. With authentication at the centre of the vulnerability, delaying the update offers little benefit for most users.
MacBook Air availability faces a separate problem
Apple’s security update arrives as the company is also reportedly dealing with tighter availability of its MacBook Air lineup.
Recent reports have pointed to longer shipping estimates for several MacBook Air configurations. The reported delays have been linked to constraints in the global memory supply chain, with some buyers facing delivery dates that extend into late August or early September.
The availability issue is separate from the macOS security update, but it highlights the different challenges Apple is currently dealing with across its Mac business. While the software side is receiving a targeted security fix, hardware buyers may have to wait longer than usual to receive certain MacBook Air models.
For existing Mac owners, however, the immediate priority is simpler. Check Software Update, install the latest supported security release and make sure the Mac is running a version that continues to receive updates from Apple.
The release of macOS Tahoe 26.6.1 also serves as a reminder that security updates should not be ignored simply because they do not come with headline features. A vulnerability that could bypass normal authentication can potentially expose users to unwanted remote access, making a relatively small software update an important one.
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