iOS Update 18.3.1 Released to Patch Security Vulnerability.

Apple has released updates for various devices including iPhone, iPad, Mac, Apple Watch, and Vision Pro. Here are the details:

iOS 18.3.1 and iPadOS 18.3.1 address security bugs and vulnerabilities, so it is recommended for everyone to update.
macOS Sequoia 15.3.1 fixes bugs and security vulnerabilities.
watchOS 11.3.1 addresses a security vulnerability.
visionOS 2.3.1 also fixes a security vulnerability.

This update focuses on fixing security vulnerabilities that could allow attackers to bypass Restricted Mode and unlock locked devices. Apple has not provided updates for older devices that cannot be updated to the latest operating system versions, including:

iPadOS 17.7.5
macOS Sonoma 14.7.4
macOS Ventura 13.7.4

Source: MacRumors

TLDR: Apple has released updates for various devices to fix security vulnerabilities, urging users to update for improved safety.