Macos High Sierra 10.13.1 Jun 2026

Version 10.13.1 (via subsequent security updates) was essential in fixing a critical flaw that allowed anyone to gain "root" administrative access by simply entering "root" as a username without a password.

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Apple released a full “Combo Update” (2.8 GB) for those on 10.13.0 or earlier betas. This package is still available on Apple’s support website (support.apple.com/downloads). Search for “High Sierra 10.13.1 Combo.” This version often resolves issues that the delta updater misses.

However, a major complication soon emerged. It was discovered that for users upgrading from , the security patch would be undone or reversed . Worse still, even reapplying the security patch did not fully seal the hole until the Mac was restarted, a requirement not communicated by the installation process. This meant that many users who thought they were protected were in fact still vulnerable after the major 10.13.1 update. Apple issued a rare, public apology for this massive oversight, stating: "Security is a top priority for every Apple product, and regrettably we stumbled with this release of macOS." The official fix was incorporated into the subsequent macOS High Sierra 10.13.2 update. macos high sierra 10.13.1

: High Sierra officially reached "End of Life" in late 2020. It no longer receives security updates from Apple.

Some older Macs experience a loop during the APFS firmware update phase. This is often fixed by resetting the NVRAM/PRAM before running the installer.

If you are already running macOS 10.13, you can apply the 10.13.1 update directly. Version 10

Included more expressive smiley faces and gender-neutral characters.

Search for and download the official package from Apple's Support Downloads page. Double-click the downloaded .dmg file to mount it.

Building on this foundation, macOS 10.13.1 was released to the public on (build number 17B48). It was positioned as a classic “.1” update—its primary focus was on delivering bug fixes, performance enhancements, security patches, and critical enterprise improvements. Apple recommended it for all users. This package is still available on Apple’s support

10.13.1 solidified this transition for compatible machines. It also introduced a new safety mechanism for APFS drives: the 10.13.1 installer creates an APFS "snapshot" of the system state before making changes, offering users a new, robust way to revert their system should an update encounter a catastrophic failure. This feature was a significant step forward in system resilience and recoverability.

What’s not great

The most critical fix in 10.13.1 was a patch for the vulnerability, a serious flaw in the WPA2 Wi-Fi protocol. This attack could allow a malicious actor within range of your Wi-Fi to decrypt network traffic and potentially steal sensitive information. This patch was a primary reason the update was strongly recommended for all users.