CVE-2026-84541 in macOS
Summary
by MITRE • 09/15/2026
An input validation issue was addressed with improved input validation. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. An application may be able to access restricted files.
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Analysis
by VulDB Data Team • 09/15/2026
The vulnerability described involves a critical failure in the operating system's input validation mechanisms within Apple’s macOS ecosystem, specifically affecting versions prior to macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7. This flaw stems from insufficient sanitization or verification of user-supplied data before it is processed by privileged system components. In secure software architecture, input validation serves as the primary defense against various injection attacks and unauthorized access patterns. When this layer fails, an attacker can manipulate internal state variables or file paths in ways that bypass intended security controls. The specific manifestation here allows a local application to traverse directory boundaries or exploit logic errors to reach files that are explicitly restricted by the operating system's permission model. This represents a significant degradation of the principle of least privilege, which dictates that processes should only have access to resources strictly necessary for their function.
From a technical perspective, this issue aligns with Common Weakness Enumeration (CWE) categories such as CWE-20 Improper Input Validation and potentially CWE-732 Incorrect Permission Assignment for Critical Resource if the underlying cause is related to how permissions are evaluated after path manipulation. The ability of an application to access restricted files suggests that the vulnerability may involve directory traversal techniques or symbolic link attacks, where malicious input causes the system to resolve paths outside the intended sandboxed environment. In modern macOS versions, Apple employs strict sandboxing and entitlements to isolate applications from sensitive user data and system configurations. A bypass in these restrictions undermines the integrity of the security boundary that protects user privacy and system stability. An attacker leveraging this flaw could potentially read confidential documents, extract cryptographic keys stored in keychains, or access configuration files containing authentication credentials, leading to a complete compromise of user confidentiality.
The operational impact of this vulnerability is severe for both individual users and enterprise environments running affected macOS versions. For end-users, the primary risk involves data exfiltration where malicious software installed on the device can silently copy sensitive personal information without triggering standard security alerts or requiring elevated privileges through traditional privilege escalation paths. In corporate settings, this could lead to the leakage of proprietary intellectual property, employee credentials, or customer data protected under regulations such as GDPR or HIPAA. Furthermore, because the vulnerability allows access to restricted files rather than just executing arbitrary code, it serves as a potent enabler for further attacks. An adversary can use the accessed information to craft more sophisticated social engineering campaigns, perform lateral movement within a network if credentials are found, or establish persistence mechanisms by modifying system configuration files that were previously protected from user-space modification.
Mitigation strategies must prioritize immediate patching and proactive monitoring. The most effective remediation is to update all affected systems to macOS Golden Gate 27, macOS Sequoia 15.8, or macOS Tahoe 26.7, where Apple has implemented improved input validation routines that correctly sanitize file paths and enforce permission checks before granting access. Organizations should ensure their deployment pipelines are configured to automatically push these updates to all endpoints as soon as they become available. In the interim, administrators can mitigate risk by enforcing strict application control policies using tools like Gatekeeper or third-party endpoint detection and response solutions that monitor for unusual file system access patterns indicative of path traversal attempts. Additionally, reviewing application entitlements and ensuring that only trusted applications are granted broad filesystem permissions can reduce the attack surface. Regular audits of installed software and removal of unnecessary privileges will further harden systems against exploitation of this input validation flaw until patches are fully deployed across all environments.