A privacy issue was addressed with improved handling of user preferences. This issue is fixed in Safari 17.3, iOS 16.7.5 and iPadOS 16.7.5, iOS 17.3 and iPadOS 17.3, macOS Sonoma 14.3, watchOS 10.3. A user's private browsing activity may be visible in Settings.
http://seclists.org/fulldisclosure/2024/Jan/39
http://seclists.org/fulldisclosure/2024/Jan/36
http://seclists.org/fulldisclosure/2024/Jan/34
https://support.apple.com/kb/HT214063
https://support.apple.com/kb/HT214061
https://support.apple.com/kb/HT214056
https://support.apple.com/en-us/HT214063
https://support.apple.com/en-us/HT214061
https://support.apple.com/en-us/HT214060
https://support.apple.com/en-us/HT214059
https://support.apple.com/en-us/HT214056
https://support.apple.com/en-us/120339
https://support.apple.com/en-us/120310
https://support.apple.com/en-us/120309