iOS 18.3.2 is a critical security update for iPhone users, particularly those with older models, as it addresses a significant vulnerability in WebKit that has been exploited in real-world attacks. This update is compatible with iPhone XS and newer models, ensuring that these devices are protected against the WebKit flaw, which could allow malicious web content to escape the Web Content sandbox[1][2][7].
While there are no specific reports of major issues with iOS 18.3.2 on older compatible models like the iPhone XS, users should be aware of potential general issues associated with updating older devices. For instance, some users have reported that updates can sometimes cause performance issues or unexpected reboots, although these are not directly linked to iOS 18.3.2[4][6].
One notable concern with the update is that some users on Reddit have mentioned that iOS 18.3.2 may reactivate Apple Intelligence by default, which could be a privacy concern for some users. However, this can be easily disabled if desired[1].
Overall, while there are no specific known issues with iOS 18.3.2 on older iPhone models, it is crucial to update to this version to ensure security against the exploited WebKit vulnerability. Users should also be cautious about general update-related issues and monitor their device's performance post-update.
Citations:
[1] https://www.forbes.com/sites/kateoflahertyuk/2025/03/12/ios-1832-update-now-warning-issued-to-all-iphone-users/
[2] https://appleinsider.com/articles/25/03/11/dont-wait-to-update-ios-1832-fixes-an-actively-exploited-issue
[3] https://www.reddit.com/r/apple/comments/1dcj1il/revealed_ios_18_will_be_compatible_with_these/
[4] https://www.reddit.com/r/iPhone15Pro/comments/1iikf0t/be_careful_updating_to_official_ios_183/
[5] https://www.independent.co.uk/extras/indybest/gadgets-tech/phones-accessories/ios-18-3-features-apple-intelligence-b2687825.html
[6] https://support.apple.com/en-us/121161
[7] https://www.securityweek.com/apple-ships-ios-18-3-2-to-fix-already-exploited-webkit-flaw/
[8] https://support.apple.com/guide/iphone/iphone-models-compatible-with-ios-18-iphe3fa5df43/ios
[9] https://discussions.apple.com/thread/255780268
[10] https://www.forbes.com/sites/davidphelan/2025/03/12/ios-1832-apple-releases-surprise-iphone-update-to-fix-frustrating-bug-update-now-warning-recommended-for-all-users/