Safari 27 Security Update

What Safari 27 Fixes

Safari 27, released September 14, 2026, fixes 8 vulnerabilities in 4 parts of the system, according to Apple's security advisory.

Apple does not say that any of them were exploited before the fix. That makes Safari 27 a routine security update: worth installing soon, not an emergency.

It has since been superseded: the newest security release for Safari is Safari 27.2, from October 26, 2026, which includes these fixes.

Grouped by us from the impact Apple gives for each fix; the impact lines below are Apple's own.

Which Devices Get Safari 27

Apple lists Safari 27 for: macOS Sequoia and macOS Tahoe.

How to Install Safari 27

Safari updates arrive through Software Update on the Mac. On a current macOS they are part of the macOS update; on older versions they are offered separately.

Security fixes are cumulative: any later release for the same version includes these as well, so if you are already past Safari 27 there is nothing to do.

Every Fix in Safari 27

All 8 CVEs in Apple's advisory, the most serious kinds first. Each entry is the part of the system affected, Apple's description of the impact and the fix, and the CVE ID.

• WebKit

  Processing maliciously crafted web content may lead to arbitrary code execution

  A type confusion issue was addressed with improved state management.

  CVE-2026-86922

• Safe Browsing

  An app may be able to access sensitive user data

  This issue was addressed with additional entitlement checks.

  CVE-2026-86897

• WebKit

  Processing maliciously crafted web content may disclose sensitive user information

  A permissions issue was addressed by removing the vulnerable code.

  CVE-2026-64753

• WebKit

  Opening a maliciously crafted webarchive file may lead to universal cross-site scripting

  A logic issue was addressed with improved state management.

  CVE-2026-86898

• WebKit

  Processing maliciously crafted web content may lead to an unexpected process termination

  A logic issue was addressed with improved state management.

  CVE-2026-84635

• WebKit Canvas

  Processing maliciously crafted web content may lead to an unexpected Safari crash

  A use-after-free issue was addressed with improved memory management.

  CVE-2026-64718

• Safari

  A malicious website may be able to determine what apps a user has installed

  This issue was addressed through improved state management.

  CVE-2026-84518

• WebKit

  Processing maliciously crafted web content may lead to unexpected behavior

  A logic issue was addressed with improved state management.

  CVE-2026-86872

Safari Security Release History

Safari 27 in context: the security releases Apple has published for Safari, newest first, with the number of fixes each carried.

The Same Fixes Elsewhere

Apple ships most fixes to every platform that shares the code, and to older versions still under support. These releases close at least one of the same CVEs:

Frequently Asked Questions