macOS Sequoia 15.1.1 Update Everything You Need to Know!

macOS Sequoia 15.1.1 is now Available!

UPDATED: 11/21/24

This article will be continually updated as new information comes in.

Apple just released the 2nd minor point release for macOS Sequoia! Let’s jump in and find out what’s new.

Apple’s update notes list the following “This update provides important security fixes and is recommended for all users.”

NOTE (UPDATE 9:00PM This issue is fixed!!!) If you are trying to restore macOS Sequoia 15.1.1 on Apple Silicon you will get an error. “The System cannot be restored on this device” This is due to Apple not uploading the proper decryption keys.

Affected versions: Sequoia 15.1.1 (24B91) & (24B2091) M4 visionOS 2.1.1 (22N591) 1. Restore Sequoia 15.1.1 IPSW 2. Create a Sequoia 15.1.1 VM 3. Restore visionOS 2.1.1 IPSW

Also updated was Safari 18.1.1 (20619.2.8.11.12). This version is included in the macOS Sequoia 15.1.1 Update. Version 18.1.1 is also available as a standalone update for macOS Sonoma and Ventura.

OpenCore Legacy Patcher for Unsupported Macs

OCLP 2.1.2 & macOS 15.1.1: = Testing complete against my fleet of 13 Mac models with no major issues found.

Kernel Debug Kit (KDK) Status: = Kernel_Debug_Kit_15.1.1_build_24B91.dmg https://github.com/dortania/KdkSupportPkg/releases

MetallibSupportPkg Status: = 15.1.1-24B91.pkg https://github.com/dortania/MetallibSupportPkg/releases

macOS Sequoia Patch Notes Summary

  • 1. New Features/Improvements – 0
  • 2. Operating Sytem Bug Fixes – 0
  • 3. Security Fixes – 1
  • 4. Enterprise Changes – 0
  • 5. Safari Security (Webkit) – 1
  • 6. Full installer & M1 IPSW – Full installer and Apple Silicon IPSW are available for download.

Full Apple Update Release list

  1. Sequoia 15.1.1 (24B91)
  2. Sequoia 15.1.1 (24B2091) M4 ONLY
  3. iOS & iPadOS 18.1.1 (22B91)
  4. iOS & iPadOS 17.7.2 (21H221)
  5. visionOS 2.1.1 (22N591)

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Table of Contents

  • 1. macOS Sequoia Apple Links
  • 2. macOS Sequoia Final Release History
  • 3. macOS Sequoia Full Installer.app
  • 4. Apple Silicon macOS Sequoia IPSW Restore file Database
  • 5. macOS Sequoia Update sizes
  • 6. Apple Silicon System Firmware Version
  • 7. Apple Silicon OS loader Version (iBoot)
  • 8. Intel T2 BridgeOS Update
  • 9. Intel T2 Firmware Update
  • 10. Safari Update
  • 11. What’s new for enterprise in macOS Sequoia
  • 12. Security Content of macOS Sequoia
  • 13. macOS Sequoia Release Notes / Patch Notes / Changes

Click “Continue Reading” for the rest of the article.

1. Apple macOS Links

When Apple releases the official macOS Sequoia support links, they will be listed below.

  1. What’s new in the updates for macOS Sequoia – https://support.apple.com/en-us/120283
  2. What’s new for enterprise in macOS Sequoia – https://support.apple.com/en-us/121011
  3. Apple Security Updates Page – https://support.apple.com/en-us/HT201222
  4. macOS Sequoia features page – https://www.apple.com/macos/macos-sequoia/
  5. Platform Security Guide – macOS Rapid Security Response system.
  6. Platform Guide Deployment – What’s new in Apple platform deployment
  7. AppleSeed Notes Link = appleseed.apple.com/
  8. Apple Developer Public Link = developer.apple.com/documentation/macos-release-notes
  9. macOS Deployment References Changes – https://support.apple.com/guide/deployment-reference-macos/document-revision-history-apd04dff7069/web

2. macOS Sequoia 15 Final Release History

  • 4. macOS Sequoia 15.1.1 (24B91) – 11/19/24
  • 3. macOS Sequoia 15.1 (24B83) – 10/28/24
  • 2. macOS Sequoia 15.0.1 (24A348) – 10/04/24
  • 1. macOS Sequoia 15.0 (24A335) – 9/16/24

3. macOS Sequoia 15 Full Installer.app

Apple has released the full installer for macOS Sequoia. I list all the of the Full installers in the link below.

https://mrmacintosh.com/macos-sequoia-full-installer-database-download-directly-from-apple/

InstallAssistant.pkg = Full download. Installing this package will add the full “Install macOS Sequoia.app” to your applications folder.

4. Apple Silicon macOS Sequoia IPSW Restore file Database

Apple has released the full IPSW restore file of macOS for Apple Silicon M1,M2 & M3 Macs. I keep track of all of them in my Apple Silicon Firmware Database

Get them here –> https://mrmacintosh.com/apple-silicon-m1-full-macos-restore-ipsw-firmware-files-database/

5. macOS Sequoia Update sizes

Sequoia Delta Update

The delta update will automatically change in size for exactly what your macOS version needs.

Full update & Sequoia OCLP Users = 14.53GB

Apple Silicon Updates

Delta from macOS 15.1 with size = 1.29GB

Intel Updates

Delta from macOS 15.1 with size = 651.1MB

6. Apple Silicon System Firmware Version

This update has a new firmware update. The version number is reported in System Information under “System Firmware Version“

Apple Silicon Firmware = Not Updated

  • 4. macOS Sequoia 15.1.1 = 11881.41.5
  • 3. macOS Sequoia 15.1 = 11881.41.5
  • 2. macOS Sequoia 15.0.1 = 11881.1.1
  • 1. macOS Sequoia 15.0 = 11881.1.1

7. Apple Silicon OS loader Version (iBoot)

OS Loader Version (iBoot) also referred to as “iBoot second-stage loader”, is Apple’s stage 2 bootloader. The OS loader version will be the same as the “System Firmware Version” on the latest OS. On previous versions of macOS Monterey and Big Sur, the OS loader version will be a version behind. Example = Monterey = 7459.121.3 & Big Sur = 6723.140.2

OS Loader version = Not Updated

  • 4. macOS Sequoia 15.1.1 = 11881.41.5
  • 3. macOS Sequoia 15.1 = 11881.41.5
  • 2. macOS Sequoia 15.0.1 = 11881.1.1
  • 1. macOS Sequoia 15.0 = 11881.1.1

8. Intel T2 BridgeOS Update

The Version of BridgeOS for your T2 Security Chip (2018-2020 Intel Macs) was updated.

BridgeOS version = Not Updated

  • 4. macOS Sequoia 15.1.1 = 22.16.11072.0.0
  • 3. macOS Sequoia 15.1 = 22.16.11072.0.0
  • 2. macOS Sequoia 15.0.1 = 22.16.11053.5.1,0
  • 1. macOS Sequoia 15.0 = 22.16.11053.5.1,0

9. Intel T2 Firmware Update

The version of firmware for your Mac (2018-2020 Intel Macs) was updated.

Firmware version = Not Updated

  • 4. macOS Sequoia 15.1.1 = 2069.40.2.0.0
  • 3. macOS Sequoia 15.1 = 2069.40.2.0.0
  • 2. macOS Sequoia 15.0.1 = 2069.40.2.0.0
  • 1. macOS Sequoia 15.0 = 2069.40.2.0.0

10. Safari Update

The new version of Safari 18 is included in the macOS 15 update.

Safari = Updated!

  • 4. macOS Sequoia 15.1.1 = Version 18.1.1 (20619.2.8.11.12)
  • 3. macOS Sequoia 15.1 = Version 18.1 (20619.2.8.11.10)
  • 2. macOS Sequoia 15.0.1 = Version 18.0.1 (20619.1.26.31.7)
  • 1. macOS Sequoia 15.0 = Version 18.0 (20619.1.26.31.6)

11. What’s new for Enterprise in macOS 15

Enterprise changes in macOS Sequoia

  • None

https://support.apple.com/en-us/121011

12. Security Content of macOS 15.1

Security vulnerabilities in this Update

Fixes addressed in this update = 1

Safari Webkit = 1

https://support.apple.com/en-us/100100

13. macOS 15.1.1 Release Notes

macOS Sequoia updates improve the stability, performance, or compatibility of your Mac and are recommended for all macOS Sequoia users.

macOS Sequoia 15.1.1

Released November 19, 2024

JavaScriptCore

Available for: macOS Sequoia

Impact: 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.

Description: The issue was addressed with improved checks.

WebKit Bugzilla: 283063

CVE-2024-44308: Clément Lecigne and Benoît Sevens of Google’s Threat Analysis Group

WebKit

Available for: macOS Sequoia

Impact: 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.

Description: A cookie management issue was addressed with improved state management.

WebKit Bugzilla: 283095

CVE-2024-44309: Clément Lecigne and Benoît Sevens of Google’s Threat Analysis Group

 

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