Apple's iOS 18.3 fixes a hefty list of 29 vulnerabilities, one of which has already been used in ... [+] attacks.Apple iPhoneApple has issued iOS 18.3, along with a warning to update your iPhone now. Thats because iOS 18.3 fixes a hefty list of 29 vulnerabilities, one of which has already been used in attacks.Apple doesnt give much detail about the issues fixed in iOS 18.3, because it wants to give people as much time to update as possible before attackers can get hold of the details.But the already exploited issue patched in iOS 18.3 is a flaw in CoreMedia tracked as CVE-2025-24085 that could see a malicious application able to elevate privileges.Apple is aware of a report that this issue may have been actively exploited against versions of iOS before iOS 17.2, the iPhone maker said on its support page.Whats Fixed In iOS 18.3Apples iOS 18.3 also fixes two bugs in the Kernel at the heart of the iOS operating system. Tracked as CVE-2025-24107, the first flaw could see a malicious app able to gain root privileges. Meanwhile, the second issue could allow an app to execute code with Kernel privileges.MORE FOR YOUThe iOS 18.3 update patches several flaws in WebKit, the engine that underpins the Safari browser. A bug in WebKit Web Inspector could lead to command injection where a malicious hacker tricks an application into executing operating system commands.Meanwhile, an issue in AirPlay tracked as CVE-2025-24137 could allow a remote attacker to cause an unexpected application termination or code execution.Another bug in Passkeys could see an adversary use an app to gain unauthorized access to Bluetooth.Why You Should Update To iOS 18.3 NowApple released iOS 18.3 alongside iPadOS 17.7.4, but there is no iOS 17.7.4 update yet. This could be because iOS 17 is not affected, or because Apple is no longer offering the update to newer devices, or the details arent available yet.But at least for now, the lack of available iOS 17 updates means you will be more secure if you update to iOS 18.When you do upgrade to iOS 18.3, note that Apple has automatically enabled AI for iPhone 15s and above, so check your settings and disable if you want.Apples iOS 18.3 is available for the iPhone XS and later, iPad Pro 13-inch, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 7th generation and later and iPad mini 5th generation and later.In my mind, upgrading to iOS 18.3 is a no-brainer. The update fixes an issue thats been exploited in real-life attacks, making it important that you update as soon as possible to keep your iPhone safe.So, what are you waiting for? Go to your iPhone Settings > Software Update and download and install iOS 18.3 now.