Today Apple released its latest array of major software updates. Now, the company has outlined all the security fixes introduced by iOS 18.4, macOS 15.4, and more.Security updates detailed in new support documentsNew features are a big motivator for a lot of users to install software updates. And todays new software has a lot to offer on that front. But whether you care about feature updates or not, security fixes are perhaps an even better reason to update sooner rather than later.As it does with each new release, Apple has shared details on exactly which security issues were addressed with this latest software launch.You can find full lists of security updates here:Each update comes with an especially long list of security fixes. Browsing the lists, some areas that received a lot of attention include Siri, WebKit, apps breaking out of sandboxes, and various other vulnerabilities.Do any security updates in iOS 18.4 or the other updates stand out to you? Let us know in the comments.Best iPhone accessoriesAdd 9to5Mac to your Google News feed. FTC: We use income earning auto affiliate links. More.Youre reading 9to5Mac experts who break news about Apple and its surrounding ecosystem, day after day. Be sure to check out our homepage for all the latest news, and follow 9to5Mac on Twitter, Facebook, and LinkedIn to stay in the loop. Dont know where to start? Check out our exclusive stories, reviews, how-tos, and subscribe to our YouTube channel