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Apple released new software updates today, including iOS 18.4, macOS Sequoia 15.4, tvOS 18.4, and visionOS 2.4. In addition to new features, the focus is primarily on security. Official details on the fixed security vulnerabilities are now available. Anyone using an Apple device should take a close look at the changes.
New features are always a topic of conversation with Apple updates. But with iOS 18.4 and the other current versions, it's worth looking at something else: the list of security fixes. As usual, Apple has published support documents detailing exactly which vulnerabilities have been fixed. And the list is long. Some of them affect key functions like Siri, WebKit, or app behavior within the system. So, the update isn't just a nice-to-have—it's security-related.
Security vulnerabilities in iOS 18.4 and iPadOS 18.4
Apple has fixed numerous security issues with iOS and iPadOS 18.4. The documents make it clear that, among other things, Siri has been improved to avoid potential privacy issues. Vulnerabilities in WebKit – the engine used by Safari and many apps to load web content – have also been eliminated. An attacker could have potentially executed malicious code via manipulated web content. Apps that had access to system functions beyond the so-called sandbox have also been restricted. Such errors can lead to apps being granted more rights than they should – a risk to device security. Other patches affect, among other things, the kernel component, access to sensitive information, and protection against potentially malicious files (via Apple security releases ).
Security fixes in macOS Sequoia 15.4
macOS 15.4 brings similar fixes to iOS. Issues related to WebKit, Siri, and app isolation have also been addressed. Additionally, there are fixes for potential vulnerabilities in system permissions management and access to sensitive user data. A stable and secure operating system is crucial, especially for a system like macOS, which serves as a work platform for many. The list of patches underscores the urgent need for action here as well.
Updates also for tvOS 18.4 and visionOS 2.4
tvOS and visionOS are also receiving important updates. Although these systems are less in the spotlight, they contain security components that could provide points of attack. Apple has closed various vulnerabilities in both versions – including those affecting system behavior when processing media content or communicating with other devices.
What you should do now
If you use an Apple device—whether it's an iPhone, iPad, Mac, Apple TV, or Apple Vision Pro—you should install the update promptly. The fixed security vulnerabilities affect core functions that you use regularly in everyday life. Even if you don't need new features, the security improvements are a good reason to update. Apple provides a complete list of all fixed security issues on its support website. There's a separate document with technical details for each system.
iOS 18.4 and beyond: Protection against real risks
With iOS 18.4, macOS 15.4, and subsequent updates, Apple has not only delivered new features but also closed extensive security vulnerabilities. The fixes affect sensitive areas such as Siri, WebKit, app permissions, and access to user data. For you, this means: An update is not only sensible, but highly recommended. Anyone who wants to use their devices securely should act now. (Photo by Unsplash+ / TSD Studio)
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