Should you update to Safari 27?
No: install Safari 27.2 instead. Safari 27 is a security update Apple released on 14 Sep 2026 for Mac. It fixes 8 security flaws.[1] None of them is known to be used in attacks.
It has since been replaced by Safari 27.2, released 26 Oct 2026, which includes all of its fixes. If you’re on an older version, install that instead.
Should you update?
No: install Safari 27.2 instead. Safari 27.2 came out on 26 Oct 2026 and includes every fix in Safari 27, so there’s no reason to stop at this one. Software Update offers the newest version your Mac can run.
Is Safari 27 still safe?
Not any more. Safari 27.2 fixes 33 security flaws that Safari 27 doesn’t, and each became public the day its fix shipped. Installing it is safe: get it only from System Settings → General → Software Update, never from a link in an email, text or pop-up.
What it fixes
Apple lists 8 security flaws across 4 parts of Safari. For each, Apple says what an attacker could have done before the fix.[1]
| Part | Flaws | What an attacker could do |
|---|---|---|
| WebKit | 5 | Processing maliciously crafted web content may lead to an unexpected process termination |
| Safari | 1 | A malicious website may be able to determine what apps a user has installed |
| Safe Browsing | 1 | An app may be able to access sensitive user data |
| WebKit Canvas | 1 | Processing maliciously crafted web content may lead to an unexpected Safari crash |
How to update, and how long it takes
Usually a few minutes on its own, or as part of a macOS update. Quit Safari first.
- Back up first if you can.iCloud backup or your computer. Updates rarely go wrong, but a backup makes it painless if one does.
- Open Apple menu → System Settings → General → Software Update (Safari updates come with macOS, or on their own for older Macs).Your Mac shows the newest version it can run. Tap or click Update Now, or Upgrade Now for a new major version.
- Leave it plugged in.It downloads, prepares and restarts. Expect 15 to 45 minutes.
- Turn on automatic updates.In the same place, under Automatic Updates, turn on both downloading and installing security responses and updates.
To check it worked: Safari → About Safari shows the version. It should say 27.2 or later.
Before and after
- After: Safari 27.2, 26 Oct 2026, 33 security flaws
- Safari updates, every release and the latest version
- Updates, the latest version of everything HARD tracks
References
- ^ Apple. “About the security content of Safari 27”, 14 Sep 2026.