Apple strengthens Mac security, widens bug bounty push

Apple is strengthening macOS security with a mix of built-in malware protections, behavioural detection systems and expanded safeguards against social engineering attacks, while also widening its security research and bug bounty efforts.

Modern macOS protections go beyond traditional anti-virus approaches by combining cryptographic system sealing, app notarisation and XProtect, Apple’s built-in anti-malware technology. The notarisation allows it to identify malicious software and infrastructure before malware is widely deployed, helping block threats earlier in the attack cycle.

XProtect, integrated directly into macOS, now includes both signature-based and behavioural detection along with automated remediation capabilities. This gives it multiple ways to respond to malware campaigns, including blocking malicious apps, revoking developer certificates and updating XProtect signatures.

With cybercriminals increasingly relying on social engineering instead of conventional malware delivery methods, Apple has also introduced new safeguards in macOS Tahoe 26.4. Attackers are increasingly attempting to trick users into manually pasting commands into Terminal to install infostealer malware and bypass native Mac protections.

To counter this, macOS 26.4 introduces new warnings when relatively inexperienced users paste commands into Terminal. Apple has also added new XProtect signatures to detect malicious scripts and expanded Terminal-based alerts tied to known harmful sources. The warnings are disabled during the first 24 hours of setting up a new Mac and for users with developer tools such as Xcode installed, though warnings linked to known malicious content will always appear.

Apple has also updated FileVault recovery handling in macOS 26.4 by moving recovery keys into the end-to-end encrypted Passwords app. According to the company, this reduces the risk of recovery keys being exposed or lost.

Separately, Apple has started rolling out “Background Security Improvements” across macOS, iOS and iPadOS. Introduced with macOS 26.3.1, the mechanism allows the company to push smaller security fixes and protections for components such as Safari, WebKit and system libraries between full software updates.

Alongside platform security updates, Apple continues to expand its bug bounty program, which rewards security researchers for identifying vulnerabilities across Apple products and services. The company said the programme has evolved to cover a wider range of attack categories and security research areas as threats targeting Apple devices become more sophisticated. The rewards have been almost doubled by the Apple for those who find bugs across its ecosystem.