Hey Hey! Update your iPhone today!
Apple just blocked an attack discovered by my Citizen Lab teammate Bill Marczak.
Allowed a bypass of Apple's USB Restricted Mode on locked devices.
Actively used by a sophisticated attacker.
Stay safe out there.
And avoid leaving your phones unattended.

Apple Support
About the security content of iOS 18.3.1 and iPadOS 18.3.1 - Apple Support
This document describes the security content of iOS 18.3.1 and iPadOS 18.3.1
