Safari 18 Security Update

What Safari 18 Fixes

Safari 18, released September 16, 2024, fixes 7 vulnerabilities in 3 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 18 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It has since been superseded: the newest security release for Safari is Safari 27.2, from October 26, 2026, which includes these fixes.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 18

Apple lists Safari 18 for: macOS Ventura and macOS Sonoma.

How to Install Safari 18

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 18 there is nothing to do.

Every Fix in Safari 18

All 7 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.

• Safari

  Maliciously crafted web content may violate iframe sandboxing policy

  A custom URL scheme handling issue was addressed with improved input validation.

  CVE-2024-44155

• Safari Private Browsing

  Private Browsing tabs may be accessed without authentication

  An authentication issue was addressed with improved state management.

  CVE-2024-44202

• WebKit

  A malicious website may exfiltrate data cross-origin

  A cookie management issue was addressed with improved state management.

  CVE-2024-54467

• WebKit

  Visiting a malicious website may lead to address bar spoofing

  The issue was addressed with improved UI.

  CVE-2024-40866

• WebKit

  A malicious website may exfiltrate data cross-origin

  A cross-origin issue existed with "iframe" elements. This was addressed with improved tracking of security origins.

  CVE-2024-44187

• WebKit

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

  The issue was addressed with improved checks.

  CVE-2024-44192

• WebKit

  Processing maliciously crafted web content may lead to universal cross site scripting

  This issue was addressed through improved state management.

  CVE-2024-40857

Safari Security Release History

Safari 18 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