CVE-2025-43378 is a permissions-related vulnerability in Apple macOS that allows an application to access sensitive user data improperly. The root cause is a permissions misconfiguration that fails to adequately restrict app access to certain user data, classified under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor). Exploitation requires local access (AV:L), low attack complexity (AC:L), no privileges (PR:N), but does require user interaction (UI:R), such as the user running or interacting with a malicious app. The vulnerability affects macOS versions prior to Sequoia 15.7.2 and Tahoe 26.1, where Apple has implemented additional restrictions to close this gap. The impact is limited to confidentiality, with no effect on integrity or availability. No known exploits have been reported in the wild, indicating this is a recently disclosed issue. The vulnerability highlights the importance of strict permission enforcement in operating systems to prevent unauthorized data access by apps. Given the medium CVSS score of 5.5, the vulnerability is moderately severe but not critical, reflecting the need for user interaction and local access for exploitation.

The primary impact of CVE-2025-43378 is unauthorized disclosure of sensitive user data on affected macOS systems. This can lead to privacy violations, leakage of personal or corporate confidential information, and potential downstream attacks if sensitive data is harvested. Organizations relying on macOS devices for handling sensitive information, including enterprises, government agencies, and individuals, face risks of data exposure. Although the vulnerability does not affect system integrity or availability, the confidentiality breach can undermine trust and compliance with data protection regulations. The requirement for user interaction and local access limits the attack surface, but targeted attacks or social engineering could still exploit this flaw. The absence of known exploits in the wild reduces immediate risk but does not eliminate future exploitation potential. Overall, the vulnerability poses a moderate risk to confidentiality, especially in environments with high-value data on Apple devices.

To mitigate CVE-2025-43378, organizations and users should promptly update affected macOS systems to versions Sequoia 15.7.2 or Tahoe 26.1 or later, where the permissions issue is fixed. Beyond patching, implement strict application control policies to restrict installation and execution of untrusted or unsigned apps, reducing the chance of malicious apps exploiting this vulnerability. Employ endpoint protection solutions capable of monitoring app behaviors and detecting unauthorized data access attempts. Educate users about the risks of running unverified applications and the importance of cautious interaction with apps, especially those requesting access to sensitive data. Regularly audit app permissions and system logs to identify anomalous access patterns. For organizations, consider deploying Mobile Device Management (MDM) solutions to enforce security policies and manage updates centrally. Finally, maintain robust data encryption and access controls to limit the impact of any unauthorized data exposure.