Update your Mac: Screen Share vulnerability gives attackers full control of your computer
Apple has released a critical security update for macOS that patches a Screen Share-related vulnerability.
Mac users are advised to install the most recent software update immediately to address a serious security flaw. The latest update from Apple addresses a critical vulnerability in the Screen Share feature that could grant unauthorized individuals complete control of a target Mac. The flaw stems from an authentication error in Screen Share, enabling an adversary to seize control of a user's keyboard and mouse when screen sharing is active.
This vulnerability, identified as CVE-2026-65400, enables an attacker on the same network to gain access to a Mac without proper credentials. The Netherlands National Cyber Security Centre (NCSC) raised the alarm about this issue following its public disclosure. Independent cybersecurity firm Calif reverse-engineered Apple's recent macOS patch and demonstrated the vulnerability through a video.
The NCSC report reveals that the exploit arises from inadequate state management during the authentication process. When Screen Share is enabled, the macOS firewall opens port 5900 to external entities over the internet, allowing unauthorized access via rejected authentication attempts. Reports indicate the exploit has been observed in the wild and has been used to install a Monero crypto miner on affected systems.
Apple released the patch for macOS Tahoe, Sequoia, and Sonoma. Users are strongly encouraged to install the latest security update.
Written by urgent.news from Mashable's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
