Safari 17.4 Security Update

What Safari 17.4 Fixes

Safari 17.4, released March 7, 2024, fixes 6 vulnerabilities in 2 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 17.4 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It has since been superseded: the newest security release for Safari is Safari 27.2, from October 26, 2026, which includes these fixes.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 17.4

Apple lists Safari 17.4 for: macOS Monterey and macOS Ventura.

How to Install Safari 17.4

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 17.4 there is nothing to do.

Every Fix in Safari 17.4

All 6 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 Private Browsing

  Private Browsing tabs may be accessed without authentication

  This issue was addressed through improved state management.

  CVE-2024-23273

• WebKit

  A malicious website may exfiltrate audio data cross-origin

  The issue was addressed with improved UI handling.

  CVE-2024-23254

• WebKit

  Processing web content may lead to a denial-of-service

  The issue was addressed with improved memory handling.

  CVE-2024-54658

• WebKit

  Processing maliciously crafted web content may prevent Content Security Policy from being enforced

  A logic issue was addressed with improved validation.

  CVE-2024-23263

• WebKit

  A maliciously crafted webpage may be able to fingerprint the user

  An injection issue was addressed with improved validation.

  CVE-2024-23280

• WebKit

  Processing maliciously crafted web content may prevent Content Security Policy from being enforced

  A logic issue was addressed with improved state management.

  CVE-2024-23284

Safari Security Release History

Safari 17.4 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