Apple has issued an emergency macOS security patch to address an actively exploited zero-day vulnerability (CVE-2026-4409). The security flaw, discovered by independent threat intelligence researchers, permits remote unauthenticated attackers to execute arbitrary code with highest-level root privileges.
The exploit targets a memory corruption bug in the macOS XPC daemon handling, allowing malicious code to bypass System Integrity Protection (SIP) and hijack system background processes.
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CISA and international cybersecurity agencies have added the bug to their Known Exploited Vulnerabilities catalog, urging all enterprise IT administrators to apply patches immediately.