Apple's first-ever "background security improvement" fixes a vulnerability in its Safari browser running its latest software.

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Apple has deployed its first-ever 'background security improvement' update to patch a WebKit vulnerability in Safari on iPhones, iPads, and Macs. The bug, discovered by a security researcher, could allow a malicious website to access data from another website in the same browser session. These lightweight updates, available on devices running iOS, iPadOS, and macOS version 26.1 and higher, are designed to deliver critical security fixes between major software releases and require only a quick device restart rather than a full reboot.

Apple rolls out first ‘background security’ update for iPhones, iPads, and Macs to fix Safari bug