Apple has identified a security flaw in its macOS operating system. This is an improper authentication vulnerability, meaning the system’s built-in login verification for a core feature does not work as intended. The flaw impacts macOS’s built-in Screen Sharing tool, which lets users remotely access and control a Mac from another device. An attacker connected to the same local network as an affected Mac could use this vulnerability to access Screen Sharing without entering valid login credentials. If you use a macOS device to manage your hosting services, access your website’s admin tools, or handle sensitive account information, this flaw could allow an unauthorized person to gain access to your device and any data or services reachable from it, without needing your permission or correct login details.
Source: CISA Known Exploited Vulnerabilities Catalog — https://nvd.nist.gov/vuln/detail/CVE-2026-65400
