A critical permissions vulnerability in macOS prior to version 15.6 allows sandboxed processes to escape restrictions, posing a severe threat to system-level security.

The vulnerability involves a flaw in the sandbox implementation where process restrictions can be bypassed. This allows a malicious or compromised sandboxed process to perform actions outside of its intended scope, potentially accessing restricted system resources.

The CVSS score of 9.1 highlights the critical nature of this sandbox escape. Exploitation could allow an attacker to escalate privileges or gain unauthorized access to sensitive user data and system files, rendering the operating system's security boundaries ineffective.

Immediate Action: Update all affected systems to macOS Sequoia 15.6 or later to apply the necessary sandbox security enhancements.

Proactive Monitoring: Monitor for unusual process behavior or unexpected system calls originating from sandboxed applications, which may indicate an attempt to exploit the sandbox.

Compensating Controls: Ensure that Endpoint Detection and Response (EDR) agents are updated and active to detect and block malicious activity occurring within the environment.

Public Exploit Available: Not specified

Sandbox escapes are high-impact vulnerabilities that undermine the fundamental security model of macOS. It is recommended to deploy the macOS Sequoia 15.6 update across all enterprise endpoints as soon as possible to prevent potential system compromise.