CVE-2026-84535 in macOS
Summary
by MITRE • 09/15/2026
An authorization issue was addressed with improved state management. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. An app may be able to break out of its sandbox.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 09/15/2026
The vulnerability described involves a critical flaw in the authorization and state management mechanisms within Apple's operating system environment, specifically affecting versions prior to macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7. This issue is classified as an improper access control weakness where the application runtime fails to correctly enforce boundary conditions between different security states or contexts. In modern macOS architectures, applications operate within a sandboxed environment designed to restrict their access to system resources, user data, and other processes. The flaw arises when the state management logic governing these boundaries becomes inconsistent, allowing an app to manipulate its internal state in ways that bypass intended restrictions. This mismanagement effectively creates a pathway for privilege escalation or scope expansion beyond what is permitted by the sandbox policy.
From a technical perspective, this vulnerability aligns with CWE-269, which denotes Improper Privilege Management, and more specifically relates to issues where an actor can perform actions without having been explicitly granted those permissions through proper authorization checks. The core of the problem lies in how the operating system tracks and validates the current state of an application during execution. If the state transitions are not atomic or if race conditions exist in the validation logic, a maliciously crafted app could exploit these gaps to execute code or access resources that reside outside its designated sandbox container. This breaks the fundamental isolation principle that protects both user data and system integrity from potentially untrusted software components.
The operational impact of this vulnerability is significant because it undermines the trust model upon which macOS security relies. By breaking out of the sandbox, an application could gain unauthorized read or write access to sensitive files belonging to other users or protected system directories. It may also allow for inter-process communication with privileged services that should remain inaccessible, potentially leading to further exploitation chains such as arbitrary code execution with elevated privileges. For enterprise environments and individual users alike, this represents a severe risk vector where seemingly benign applications could be weaponized to exfiltrate data, install persistent malware, or compromise the entire host system by leveraging the escalated permissions obtained through this state management flaw.
Mitigation strategies primarily involve immediate software updates provided by Apple. Administrators should ensure that all devices are running macOS Golden Gate 27, macOS Sequoia 15.8, or later versions where these state management improvements have been implemented and validated. Beyond patching, organizations should enforce strict application whitelisting policies to prevent the execution of unverified software that might attempt to exploit this condition. Additionally, monitoring for anomalous process behavior using endpoint detection and response tools can help identify attempts to escape sandbox boundaries in real-time. Security teams must remain vigilant as attackers often combine such low-level privilege escalation techniques with other vulnerabilities to achieve full system compromise, making timely patching the most effective defense against this specific threat vector.