CVE-2025-43404 is a permissions-related vulnerability in Apple macOS discovered and published in December 2025. The root cause is an insufficiently restrictive sandbox configuration that allowed applications with limited privileges to access sensitive user data beyond their intended scope. This issue falls under CWE-284 (Improper Access Control), indicating that the system failed to enforce proper permission checks. Apple addressed this vulnerability by implementing additional sandbox restrictions in macOS Tahoe 26.1, effectively preventing unauthorized data access by sandboxed apps. The vulnerability requires local access with low privileges (AV:L, PR:L), does not require user interaction (UI:N), and affects confidentiality only (C:L), with no impact on integrity or availability. The CVSS v3.1 base score is 3.3, reflecting a low severity rating. No public exploits or active exploitation campaigns have been reported. The vulnerability primarily concerns apps running on macOS that could attempt to bypass sandbox restrictions to access sensitive user data. The fix involves updating to the patched macOS version, which enforces stricter sandbox policies to close the permission gap.

The primary impact of CVE-2025-43404 is the potential unauthorized disclosure of sensitive user data by applications running on affected macOS versions prior to 26.1. While the vulnerability does not allow modification or deletion of data, nor does it affect system availability, the confidentiality breach could expose personal or corporate information, leading to privacy violations or data leakage. Organizations relying heavily on macOS for sensitive workloads or handling confidential data may face increased risk if unpatched. However, exploitation requires local access with low privileges, limiting remote attack vectors. The absence of user interaction lowers the barrier slightly but still requires an attacker to have some foothold on the system. Overall, the impact is contained but relevant for environments where data confidentiality is critical, such as enterprises, government agencies, and privacy-conscious users.

To mitigate CVE-2025-43404, organizations and users should promptly update all macOS systems to version Tahoe 26.1 or later, where the additional sandbox restrictions have been implemented. Beyond patching, administrators should enforce strict application installation policies, limiting apps to those from trusted sources and using Apple’s notarization process to reduce the risk of malicious apps exploiting sandbox weaknesses. Employing endpoint protection solutions that monitor for unusual app behaviors or unauthorized data access attempts can provide additional defense layers. Regularly auditing app permissions and sandbox configurations can help detect anomalies. For highly sensitive environments, consider restricting local user privileges further and employing application whitelisting to prevent unapproved software execution. Finally, maintain robust user awareness programs to minimize risks associated with local access by unauthorized users.