What macOS Sequoia 15.1.1 Fixes
macOS Sequoia 15.1.1, released November 19, 2024, fixes 2 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 macOS Sequoia 15.1.1 a routine security update: worth installing soon, not an emergency.
It has since been superseded: the newest security release for macOS Sequoia is macOS Sequoia 15.8.2, from October 26, 2026, which includes these fixes.
| What an attacker could do | Fixes |
|---|---|
| Run code | 1 |
| Other | 1 |
Grouped by us from the impact Apple gives for each fix; the impact lines below are Apple's own.
Which Devices Get macOS Sequoia 15.1.1
Apple lists macOS Sequoia 15.1.1 for: macOS Sequoia.
How to Install macOS Sequoia 15.1.1
On the Mac, open System Settings → General → Software Update. Macs that cannot run the newest macOS are offered the update for their own version there.
Security fixes are cumulative: any later release for the same version includes these as well, so if you are already past macOS Sequoia 15.1.1 there is nothing to do.
Every Fix in macOS Sequoia 15.1.1
All 2 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.
-
JavaScriptCore
Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited on Intel-based Mac systems.
The issue was addressed with improved checks.
CVE-2024-44308 -
WebKit
Processing maliciously crafted web content may lead to a cross site scripting attack. Apple is aware of a report that this issue may have been actively exploited on Intel-based Mac systems.
A cookie management issue was addressed with improved state management.
CVE-2024-44309
macOS Sequoia Security Release History
macOS Sequoia 15.1.1 in context: the security releases Apple has published for macOS Sequoia, newest first, with the number of fixes each carried.
| Release | Released | Fixes |
|---|---|---|
| macOS Sequoia 15.4 | March 31, 2025 | 165 |
| macOS Sequoia 15.3.2 | March 11, 2025 | 1 Exploited |
| macOS Sequoia 15.3.1 | February 10, 2025 | 1 Exploited |
| macOS Sequoia 15.3 | January 27, 2025 | 72 |
| macOS Sequoia 15.2 | December 11, 2024 | 83 |
| macOS Sequoia 15.1.1 | November 19, 2024 | 2 |
| macOS Sequoia 15.1 | October 28, 2024 | 82 |
| macOS Sequoia 15 | September 16, 2024 | 103 |
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
What does macOS Sequoia 15.1.1 fix?
2 security vulnerabilities in 2 parts of the system, from Apple's advisory of November 19, 2024. 1 could have let an attacker run code.
Was anything fixed in macOS Sequoia 15.1.1 exploited?
Apple does not say so for any of the 2 fixes.
Which devices can install macOS Sequoia 15.1.1?
macOS Sequoia.
Is macOS Sequoia 15.1.1 the latest security update?
No. macOS Sequoia 15.8.2, from October 26, 2026, is newer and includes these fixes.
Source: About the security content of macOS Sequoia 15.1.1, Apple. Rechecked automatically while Apple is still adding entries.