Safari 18.4 Security Update

What Safari 18.4 Fixes

Safari 18.4, released March 31, 2025, fixes 14 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 18.4 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It has since been superseded: the newest security release for Safari is Safari 27.2, from October 26, 2026, which includes these fixes.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 18.4

Apple lists Safari 18.4 for: macOS Ventura and macOS Sonoma.

How to Install Safari 18.4

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 18.4 there is nothing to do.

Every Fix in Safari 18.4

All 14 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.

• Authentication Services

  A malicious website may be able to claim WebAuthn credentials from another website that shares a registrable suffix

  The issue was addressed with improved input validation.

  CVE-2025-24180

• Safari

  A website may be able to bypass Same Origin Policy

  This issue was addressed through improved state management.

  CVE-2025-30466

• Web Extensions

  Visiting a website may leak sensitive data

  A script imports issue was addressed with improved isolation.

  CVE-2025-24192

• WebKit

  A malicious website may be able to track users in Safari private browsing mode

  This issue was addressed through improved state management.

  CVE-2025-30425

• Safari

  Visiting a malicious website may lead to user interface spoofing

  The issue was addressed with improved UI.

  CVE-2025-24113

• Safari

  Visiting a malicious website may lead to address bar spoofing

  The issue was addressed with improved checks.

  CVE-2025-30467

• WebKit

  Loading a malicious iframe may lead to a cross-site scripting attack

  A permissions issue was addressed with additional restrictions.

  CVE-2025-24208

• WebKit

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

  The issue was addressed with improved memory handling.

  CVE-2025-24264 CVE-2025-24216

• WebKit

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

  A buffer overflow issue was addressed with improved memory handling.

  CVE-2025-24209

• WebKit

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

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

  CVE-2025-30427

• Safari

  A website may be able to access sensor information without user consent

  The issue was addressed with improved checks.

  CVE-2025-31192

• Safari

  A download's origin may be incorrectly associated

  This issue was addressed through improved state management.

  CVE-2025-24167

• Web Extensions

  An app may gain unauthorized access to Local Network

  This issue was addressed with improved permissions checking.

  CVE-2025-31184

Safari Security Release History

Safari 18.4 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