CVE-2025-43396 is a logic vulnerability in the sandbox implementation of Apple macOS that could allow a sandboxed application to bypass intended access restrictions and read sensitive user data. The sandbox is designed to isolate applications and limit their access to system resources and user data to protect confidentiality. However, due to insufficient or flawed logic checks in the sandbox enforcement, a malicious or compromised sandboxed app may exploit this flaw to access data it should not be able to reach. The vulnerability affects multiple macOS versions prior to the patched releases: Sequoia 15.7.2, Sonoma 14.8.2, and Tahoe 26.1. The CVSS 3.1 base score is 5.5 (medium), reflecting that the attack vector is local (AV:L), with low attack complexity (AC:L), no privileges required (PR:N), but user interaction is necessary (UI:R). The scope is unchanged (S:U), and the impact is high on confidentiality (C:H) but none on integrity or availability (I:N/A:N). This means that while the attacker cannot modify or disrupt system operations, they can potentially access sensitive user data, which could include personal files, credentials, or other private information. No known exploits have been reported in the wild, but the presence of this vulnerability poses a risk especially in environments where untrusted or third-party sandboxed apps are installed. The underlying CWE is CWE-284 (Improper Access Control), indicating that the sandbox failed to enforce proper access restrictions. The fix involves improved logic checks in the sandbox code to ensure that apps cannot bypass data access controls. This vulnerability highlights the importance of robust sandbox enforcement in modern operating systems to maintain user data confidentiality.

The primary impact of CVE-2025-43396 is the potential unauthorized disclosure of sensitive user data by sandboxed applications on macOS systems. Since sandboxing is a key security mechanism to isolate apps and protect user privacy, this vulnerability undermines that protection, allowing malicious or compromised apps to access data beyond their intended scope. For organizations, this could lead to leakage of confidential information, intellectual property, or personal data, potentially resulting in privacy violations, regulatory non-compliance, and reputational damage. Although the vulnerability does not allow modification or disruption of system integrity or availability, the confidentiality breach alone can have serious consequences, especially in sectors handling sensitive data such as finance, healthcare, and government. The requirement for local access and user interaction limits remote exploitation but does not eliminate risk, as social engineering or malicious app distribution could facilitate attacks. The medium severity rating reflects a moderate risk level, but the widespread use of macOS in enterprise and consumer environments means the overall exposure is significant. Organizations relying heavily on macOS devices should consider this vulnerability a priority for patching and risk mitigation.

1. Immediately apply the security updates provided by Apple for macOS Sequoia 15.7.2, Sonoma 14.8.2, and Tahoe 26.1 or later versions to ensure the vulnerability is patched. 2. Restrict installation of applications to trusted sources such as the Apple App Store or verified enterprise app stores to reduce the risk of malicious sandboxed apps. 3. Implement strict application whitelisting policies and use Mobile Device Management (MDM) solutions to control which apps can run on organizational macOS devices. 4. Educate users about the risks of installing untrusted software and the importance of avoiding suspicious links or prompts that require user interaction. 5. Monitor system logs and use endpoint detection and response (EDR) tools to detect unusual access patterns or behaviors indicative of sandbox escape attempts. 6. Conduct regular security audits and penetration testing focused on sandbox enforcement and app isolation mechanisms. 7. Limit the use of sandboxed apps that require access to sensitive data unless absolutely necessary and ensure they have minimal permissions. 8. Maintain up-to-date backups of critical data to mitigate potential data loss from other attack vectors that might exploit this or related vulnerabilities.