CVE-2026-84631 in macOS
Summary
by MITRE • 09/15/2026
This issue was addressed with additional entitlement checks. This issue is fixed in macOS Golden Gate 27. An app may be able to gain root privileges.
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Analysis
by VulDB Data Team • 09/15/2026
The vulnerability described involves a privilege escalation flaw within the operating system's access control mechanisms, specifically related to how applications request and are granted elevated permissions. In this context, the core technical failure lies in insufficient validation of user entitlements before executing privileged operations. When an application requests root-level privileges or other high-privilege actions, the system is responsible for verifying that the requesting process possesses the necessary cryptographic signatures and explicit entitlements defined by the security policy. The flaw indicates a logic error where these checks were either bypassed, incorrectly evaluated, or entirely omitted in specific code paths, allowing an unprivileged application to execute commands with root-level authority without proper authorization. This represents a classic instance of improper privilege management, where the boundary between user space and kernel space is breached due to inadequate verification steps during the authentication and authorization phases of system calls.
From a technical perspective, this flaw aligns closely with CWE-269 Improper Privilege Management and potentially CWE-250 Execution with Unnecessary Privileges if the application did not require such high-level access for its intended function. The absence of rigorous entitlement checks means that any malicious or compromised app could exploit this gap to execute arbitrary code as root, effectively taking full control of the affected macOS instance. This is particularly dangerous because root privileges provide unrestricted read and write access to all files on the system, allowing an attacker to install persistent backdoors, modify critical system configurations, exfiltrate sensitive data such as user credentials or encryption keys, and disable security features like Gatekeeper or FileVault. The impact extends beyond simple data theft; it compromises the integrity of the entire operating environment, making detection difficult since actions performed by root are often indistinguishable from legitimate administrative tasks unless specific auditing mechanisms are in place.
The operational impact is severe, as gaining root access effectively neutralizes most standard security controls designed to protect user data and system stability. An attacker leveraging this vulnerability could establish a persistent foothold that survives reboots and application updates. They could also pivot to attack other systems on the network if the compromised machine serves as an entry point for lateral movement. Furthermore, because macOS Golden Gate 27 is involved, it suggests that even newer security architectures like Apple's notarization and runtime protection mechanisms may have had gaps in their enforcement logic regarding entitlement validation. This undermines trust in the platform's ability to isolate applications from each other and from core system components, which is a fundamental principle of modern operating system design known as least privilege.
To mitigate this risk, users must ensure that macOS Golden Gate 27 or any subsequent security update containing these additional entitlement checks is installed immediately. Apple has addressed the issue by hardening the code paths responsible for processing privilege escalation requests, ensuring that every request undergoes strict verification against the app's signed entitlements before proceeding. Administrators should also enforce application whitelisting where possible to restrict which applications are permitted to run on critical systems. Additionally, enabling detailed logging of security events can help detect attempts by unauthorized processes to escalate privileges, providing visibility into potential exploitation efforts even if they fail due to other mitigations. Regular auditing of installed software and removal of unnecessary privileged applications further reduces the attack surface available for such exploits.