Multiple validation issues were addressed with improved input sanitization. This issue is fixed in macOS Ventura 13.3, iOS 16.4 and iPadOS 16.4, iOS 15.7.4 and iPadOS 15.7.4, macOS Monterey 12.6.4, watchOS 9.4, macOS Big Sur 11.7.5. Importing a maliciously crafted calendar invitation may exfiltrate user information.
https://support.apple.com/en-us/HT213678
https://support.apple.com/en-us/HT213677
https://support.apple.com/en-us/HT213676
https://support.apple.com/en-us/HT213675