CVE-2026-65381 in macOS
Summary
by MITRE • 09/15/2026
A validation issue existed in the entitlement verification. This issue was addressed with improved validation of the process entitlement. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. A malicious 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 flaw within the entitlement verification mechanism of Apple's operating system environment, specifically affecting the integrity checks performed during application execution and privilege escalation processes. This issue stems from an insufficient validation logic that fails to rigorously verify process entitlements before granting access to protected resources or sandbox boundaries. In modern macOS architectures, applications are typically confined by a strict sandboxing model designed to limit their ability to interact with other apps, user data, and system services unless explicitly permitted through defined entitlements. When the verification of these entitlements is flawed, it creates an opportunity for privilege escalation where a malicious application can bypass expected restrictions. The core technical flaw lies in the failure to properly validate that the requesting process actually possesses the necessary permissions as declared by its code signature or configuration profile, allowing unauthorized access paths to remain open under specific conditions.
From a security architecture perspective, this vulnerability represents a significant breakdown in the principle of least privilege and sandbox enforcement mechanisms. The entitlement system is designed to act as a gatekeeper, ensuring that only authorized operations are permitted within isolated execution environments. When validation logic is bypassed or incorrectly processed, an attacker can exploit this gap to escape the confines of the application sandbox. This type of flaw is commonly categorized under CWE-284 Improper Access Control and CWE-755: Improper Handling of Exceptional Conditions if the error arises from mishandled edge cases in the verification routine. By exploiting this weakness, a malicious app can execute code with higher privileges than intended or access sensitive files and system resources that should be inaccessible to untrusted applications.
The operational impact of such a vulnerability is severe, as it undermines the fundamental security model of the operating system. A successful exploitation allows an attacker who has managed to install or run a malicious application on the target machine to break out of its sandbox isolation. This breakout capability enables further lateral movement within the system, potential theft of sensitive user data including credentials and personal information, and installation of persistent backdoors without triggering standard security alerts associated with sandbox breaches. The ability to escape sandboxing effectively neutralizes one of the primary defenses against malware execution on macOS systems, making it easier for threat actors to achieve full system compromise even if initial access was limited to a single application context.
This issue has been addressed in recent updates including macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7 through improved validation of the process entitlement verification logic. The fix likely involves stricter checks on entitlement claims during runtime initialization or privilege escalation requests, ensuring that every access attempt is rigorously validated against the application's signed identity and declared permissions. To mitigate risks associated with similar vulnerabilities in legacy systems, administrators should ensure all macOS devices are updated to the latest stable release containing these security patches. Additionally, organizations should enforce strict code signing policies and utilize runtime protection tools that monitor for anomalous behavior indicative of sandbox escape attempts, such as unexpected privilege changes or access to restricted system directories by non-administrative processes. Regular auditing of application entitlements and minimizing the number of installed applications can also reduce the attack surface available to potential exploiters seeking to leverage validation flaws in system security frameworks.