Archive: Apple released a round of security updates for older macOS versions in April 2025, including fixes for vulnerabilities reported to be under active exploitation. If you're on an older Mac, this is exactly the kind of update you shouldn't sit on.
Which Versions Were Covered
Alongside the then-current Sonoma line, Apple shipped security patches for the two preceding macOS generations — the standard support window. That keeps Macs that can't move to the latest version protected against newly discovered threats.
What Was Fixed
- WebKit zero-days: Flaws that could be exploited simply by visiting a malicious website.
- Kernel vulnerabilities: Issues that could let an app gain elevated privileges.
- Additional component fixes across system libraries shared with newer macOS releases.
Why You Should Install Immediately
When Apple patches an actively exploited vulnerability, attackers already have working code in the wild. Delaying leaves a known, exploitable hole open. Security updates like these install quickly and don't change how your Mac works — there's little reason to wait.
How to Update
- Open System Settings → General → Software Update (or System Preferences → Software Update on older versions).
- Install any available security update.
- Turn on automatic updates so future fixes apply on their own.
For a fuller checklist, see our guide on macOS security best practices.