APPLE SAFARI · CVE-2026-84518 · Other
FIX → 27.0
Apple's Safari 27 update fixes a flaw in Safari that lets a malicious website determine which apps are installed on a Mac. The advisory lists no exploitation and gives no details beyond this impact.
first public Sep 14, 2026 · 2 sources
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Safari on macOS Sequoia and macOS Tahoe is affected, and a visitor to a malicious site can trigger it without signing in. The sources do not describe any special configuration that is required.
Not affected if other-browsers, other-macos-versions
Who cares apple, macos, safari, vendor-advisory
Unknown from the sources.
Upgrade to 27.0
About the security content of Safari 27 - Apple Support
This document describes the security content of Safari 27.
For our customers' protection, Apple doesn't disclose, discuss, or confirm security issues until an investigation has occurred and patches or releases are available. Recent releases are listed on the Apple security releases page.
Apple security documents reference vulnerabilities by CVE-ID when possible.
For more information about security, see the Apple Product Security page.
Released September 14, 2026
Available for: macOS Sequoia and macOS Tahoe
Impact: A malicious website may be able to determine what apps a user has installed
Description: This issue was addressed through improved state management.
CVE-2026-84518: Bálint Magyar (balintmagyar.com)
Available for: macOS Sequoia and macOS Tahoe
Impact: An app may be able to access sensitive user data
Description: This issue was addressed with additional entitlement checks.
CVE-2026-86897: Stuart Wallace
Available for: macOS Sequoia and macOS Tahoe
Impact: Processing maliciously crafted web content may lead to an unexpected process termination
Description: A logic issue was addressed with improved state management.
WebKit Bugzilla: 310457
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CVE-2026-84635: Souta Sugiyama
Available for: macOS Sequoia and macOS Tahoe
Impact: Processing maliciously crafted web content may disclose sensitive user information
Description: A permissions issue was addressed by removing the vulnerable code.
WebKit Bugzilla: 315121
CVE-2026-64753: Viggo Lekdorf
Available for: macOS Sequoia and macOS Tahoe
Impact: Opening a maliciously crafted webarchive file may lead to universal cross-site scripting
Description: A logic issue was addressed with improved state management.
WebKit Bugzilla: 318271
CVE-2026-86898: Tomi Garcia (archyxsec)
Available for: macOS Sequoia and macOS Tahoe
Impact: Processing maliciously crafted web content may lead to arbitrary code execution
Description: A type confusion issue was addressed with improved state management.
WebKit Bugzilla: 308231
CVE-2026-86922: Nathaniel Oh (@calysteon), Kwak Kiyong / kakaogames
Entry added October 19, 2026
Available for: macOS Sequoia and macOS Tahoe
Impact: Processing maliciously crafted web content may lead to unexpected behavior
Description: A logic issue was addressed with improved state management.
WebKit Bugzilla: 318807
CVE-2026-86872: Junhyuk Im of S2W Inc, Seungyun Lee of S2W Inc
Entry added October 19, 2026
Available for: macOS Sequoia and macOS Tahoe
Impact: Processing maliciously crafted web content may lead to an unexpected Safari crash
Description: A use-after-free issue was addressed with improved memory management.
WebKit Bugzilla: 313935
CVE-2026-64718: Niels Hofmans, OGINOME Tomohito, an anonymous researcher
We would like to acknowledge Dem0ns @天府简易信工作室 for their assistance.
We would like to acknowledge Barath Stalin K (linkedin.com/in/barathstalin), Exell Nakano, Manojkumar Jaganathan (linkedin.com/in/manojkumar-j-7ba35b202/) with HackerBro Technologies, Praditya Fajar Ramadhan, Zhiyang Zeng (@Wester), shobhit srivastav for their assistance.
We would like to acknowledge @TristanInSec, Behzad Najjarpour Jabbari (@G4ru), Big Bear, Eddy Tsalolikhin, Henock Habte, Kenneth Hsu, Maher Azzouzi, Meridian Miftari, N13S, OpenAI Codex Security - Amy Burnett, Souta Sugiyama, Vitaly Simonovich, an anonymous researcher, hamayanhamayan, lattice, lebr0nli of National Yang Ming Chiao Tung University, Security and Systems Lab, ret2happy, wwwlk, and Qadhafy Muhammad Tera for their assistance.
Entry updated October 19, 2026
We would like to acknowledge Utkarsh Pal for their assistance.
We would like to acknowledge hamayanhamayan for their assistance.
Published Date: October 19, 2026
This page as .md · .json · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
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