CVE-2024-40837 is a permissions-related vulnerability in Apple macOS identified and fixed in the macOS Sequoia 15 release. The issue stems from insufficient restrictions on app permissions, allowing an application with low privileges (PR:L) and local access (AV:L) to access protected user data without requiring user interaction (UI:N). The vulnerability impacts the confidentiality of user data (C:H) but does not affect integrity (I:N) or availability (A:N). The scope is unchanged (S:U), meaning the vulnerability affects only the local system context. The vulnerability was reserved in July 2024 and published in September 2024, with no known exploits in the wild to date. The fix involves implementing additional restrictions on app permissions to prevent unauthorized data access. This vulnerability highlights the importance of strict permission enforcement in operating systems to protect sensitive user information from potentially malicious or compromised applications running with limited privileges.

The primary impact of CVE-2024-40837 is unauthorized access to protected user data on affected macOS systems. This can lead to privacy breaches, exposure of sensitive personal or corporate information, and potential compliance violations for organizations handling regulated data. Since the vulnerability does not affect integrity or availability, it does not allow data modification or system disruption, but the confidentiality breach alone can have serious consequences, including identity theft, corporate espionage, or leakage of intellectual property. The requirement for local access and low privileges limits remote exploitation but does not eliminate risk in environments where attackers can gain local access, such as through social engineering, insider threats, or compromised accounts. Organizations with macOS endpoints, especially those in sectors handling sensitive data like finance, healthcare, and government, face increased risk if unpatched.

Organizations should promptly update all macOS systems to macOS Sequoia 15 or later, where the vulnerability is fixed by additional permission restrictions. Until patching is possible, restrict local access to trusted users only and enforce strong endpoint security controls, including application whitelisting and monitoring for suspicious app behavior. Employ least privilege principles to limit app permissions and user accounts to the minimum necessary. Conduct regular audits of installed applications and their permissions to detect unauthorized or suspicious apps. Additionally, educate users about the risks of installing untrusted software and the importance of reporting unusual system behavior. For high-security environments, consider implementing endpoint detection and response (EDR) solutions capable of identifying attempts to access protected data inappropriately. Maintain up-to-date backups and incident response plans to quickly address any potential data breaches.