Executive brief
Apple macOS is the operating system that runs Mac computers. A malicious application can exploit a validation flaw in the system's security framework to escape the sandbox—a security boundary that isolates apps and prevents them from accessing the broader system. This could allow an attacker to run arbitrary code with elevated privileges, compromising user data and system integrity.
Technical details
The vulnerability is a validation issue in macOS's AppleMobileFileIntegrity entitlement verification mechanism. A malicious app can break out of its sandbox by exploiting improper validation of process entitlements. The attack requires local execution context (a malicious app already installed or running on the system) and can result in arbitrary code execution outside sandbox constraints. The fix, available in macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7, improves validation of the process entitlement. No active exploitation in the wild has been confirmed.
Affected products
- Apple macOS Golden Gate 27 and later
- Apple macOS Sequoia 15.8 and later
- Apple macOS Tahoe 26.7 and later
Timeline
- 2026-09-14: disclosed: Security advisory published alongside macOS Golden Gate 27, Sequoia 15.8, and Tahoe 26.7 releases
- 2026-09-14: patched: Fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7