A critical sandbox escape vulnerability in macOS Sequoia 15.4 allows malicious applications to bypass security protections and perform unauthorized actions.

This issue involves a protection mechanism failure (CWE-693) where insufficient checks allow an application to escape its sandbox environment, bypassing the OS-level restrictions intended to contain it.

An application breakout allows a malicious entity to gain access to files and system resources beyond the intended sandbox scope. With a CVSS score of 8.8, this vulnerability could be exploited to exfiltrate sensitive data or install persistent malware on the system.

Immediate Action: Update affected systems to the latest version of macOS as specified in the Apple security advisory.

Proactive Monitoring: Monitor for suspicious application behavior, particularly for processes attempting to access files outside of their designated directories.

Compensating Controls: Employ Endpoint Detection and Response (EDR) solutions to identify and block unauthorized system-level calls from untrusted applications.

Public Exploit Available: False

Apple users should apply the updates provided in the referenced security advisory immediately. Maintaining the OS at the latest patch level is essential to ensuring that sandbox protections remain effective against potential exploits.