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APPLE-SA-03-17-2026-1 Background Security Improvements for iOS 26.3.1, iPadOS 26.3.1, macOS 26.3.1, and macOS 26.3.2

Posted on 18 March 2026
Apple Security-announce

APPLE-SA-03-17-2026-1 Background Security Improvements for iOS 26.3.1,
iPadOS 26.3.1, macOS 26.3.1, and macOS 26.3.2

Background Security Improvements for iOS 26.3.1, iPadOS 26.3.1, macOS
26.3.1, and macOS 26.3.2 addresses the following issues.
Information about the security content is also available at
https://support.apple.com/126604.

Apple maintains a Security Releases page at
https://support.apple.com/100100 which lists recent
software updates with security advisories.

iOS 26.3.1 (a), iPadOS 26.3.1 (a), macOS 26.3.1 (a), macOS 26.3.2 (a)

WebKit
Available for: iOS 26.3.1, iPadOS 26.3.1, macOS 26.3.1, macOS 26.3.2
Impact: Processing maliciously crafted web content may bypass Same
Origin Policy
Description: A cross-origin issue in the Navigation API was addressed
with improved input validation.
WebKit Bugzilla: 306050
CVE-2026-20643: Thomas Espach


All information is also posted on the Apple Security Releases
web site: https://support.apple.com/100100.

This message is signed with Apple's Product Security PGP key,
and details are available at:
https://www.apple.com/support/security/pgp/

 

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