According to NCSC and The Hacker News, Apple patched a critical authentication vulnerability in macOS screen sharing on August 6 through emergency updates to macOS Tahoe 26.6.1, Sequoia 15.7.9, and Sonoma 14.8.9. CVE-2026-65400 (CVSS 9.8) allows attackers without valid credentials to access Macs exposed to the internet on port 5900 and deploy Monero mining software. NCSC confirmed multiple active attacks where attackers gained root access and installed cryptocurrency mining programs. The vulnerability required improved credential verification through enhanced state management. Users are advised to update systems immediately or disable screen sharing if updates are not available.
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