CVE-2026-86894 in macOS
Summary
by MITRE • 09/15/2026
A logic issue was addressed with improved checks. This issue is fixed in macOS Golden Gate 27. An app may be able to break out of its sandbox.
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Analysis
by VulDB Data Team • 09/15/2026
The vulnerability described involves a critical failure in the enforcement mechanisms governing application sandboxes within the macOS operating system, specifically resolved in the update designated as macOS Golden Gate 27. Sandboxing is a fundamental security architecture designed to restrict programs from accessing resources outside their assigned permissions, thereby limiting the potential damage if an application is compromised by malicious actors. The logic issue identified represents a flaw in how these boundary checks are executed or validated during runtime operations. When such logical errors occur, they can create unintended pathways that allow processes to bypass isolation controls, effectively breaking out of the confined environment intended for them.
From a technical perspective, this type of vulnerability typically stems from improper validation of resource access requests or race conditions in permission checking routines. An attacker could potentially exploit these logic flaws by crafting specific sequences of API calls or file system interactions that confuse the sandbox enforcement engine. By doing so, they may gain unauthorized read or write access to sensitive data stored outside the application's designated directory structure. This capability undermines the core principle of least privilege, allowing a compromised app to interact with other applications, system services, or user files that should remain inaccessible under normal operational conditions.
The operational impact of such a sandbox escape is severe and multifaceted. It enables potential data exfiltration where sensitive personal information, credentials, or proprietary business logic stored on the device can be stolen without detection by standard security monitoring tools. Furthermore, it facilitates privilege escalation scenarios where an attacker leverages the escaped process to execute arbitrary code with higher system privileges than originally granted. This significantly expands the attack surface for subsequent exploitation phases, including lateral movement within a networked environment or persistence mechanisms that survive reboots and application updates.
This vulnerability aligns closely with CWE-250, which refers to execution with unnecessary privileges, as well as CWE-787, concerning out-of-bounds write scenarios if the logic flaw involves memory corruption during boundary checks. In terms of offensive security frameworks, this behavior corresponds to techniques found in MITRE ATT&CK under T1608, specifically Forceful Privilege Escalation via Sandbox Escape or Bypassing Application Sandboxing mechanisms like AppArmor or SELinux equivalents on macOS such as Seatbelt and Gatekeeper enforcement layers. Understanding these mappings helps defenders prioritize patch deployment based on known adversary tactics that rely on breaking out of isolated environments to achieve broader system control.
Mitigation strategies primarily focus on the timely application of vendor-provided updates, in this case ensuring systems are updated to macOS Golden Gate 27 or later versions where the improved checks have been implemented. Administrators should also enforce strict code signing requirements and utilize runtime protection tools that monitor for anomalous behavior indicative of sandbox escapes, such as unexpected access patterns to protected system directories. Regular auditing of application permissions and minimizing the number of installed applications can further reduce the risk surface by limiting potential entry points for exploitation attempts targeting these logical flaws in security controls.