There are Rapid Security Responses for the latest versions of macOS Ventura 13.4.1, iOS 16.5.1 and iPadOS 16.5.1.
For the older supported versions macOS Big Sur and macOS Monterey, there’s an old-style system update that just patches Safari, which will show up as Safari 16.5.2 after the update.
So far, however [2023-07-10T23:00:00Z], there are no updates for any other Apple platforms, even though it’s possible that that iOS 15, still officially supported on older iPhones and iPads, is affected too, along with Apple Watches and TVs.
I installed this on my devices yesterday and haven’t noticed any issues, but I heard Apple pulled the update for now due to issues with some websites (including Facebook). Sounds like a change to the user agent string is causing some sites to flag Safari as an unsupported browser.
Quick edit with a link: https://mastodon.social/@zackwhittaker/110695803585722557