CVE-2025-43351 is a permissions-related vulnerability identified in Apple macOS, specifically addressed in the macOS Tahoe 26.1 update. The flaw arises from inadequate enforcement of permission restrictions, allowing an application with low-level privileges (local access and low privileges) to bypass normal access controls and read protected user data. The vulnerability does not require user interaction to be exploited, which increases its risk profile. However, it does require that the attacker already have some level of access to the system, limiting remote exploitation possibilities. The vulnerability is classified under CWE-284 (Improper Access Control), indicating that the core issue is a failure to correctly restrict access to sensitive resources. The CVSS v3.1 base score is 5.5 (medium severity), reflecting high impact on confidentiality but no impact on integrity or availability. No known exploits have been reported in the wild, suggesting limited active exploitation currently. The fix implemented in macOS Tahoe 26.1 involves adding stricter permission checks to prevent unauthorized access to protected user data by applications. This vulnerability highlights the importance of robust access control mechanisms in operating systems to protect user privacy and data security.

The primary impact of CVE-2025-43351 is the unauthorized disclosure of protected user data on affected macOS systems. If exploited, malicious applications with local access could read sensitive information without user consent, potentially leading to privacy violations, data leakage, and further targeted attacks such as identity theft or corporate espionage. Since the vulnerability does not affect system integrity or availability, it does not directly enable system compromise or denial of service. However, the confidentiality breach alone can have significant consequences for individuals and organizations, especially those handling sensitive or regulated data. The requirement for local access and low privileges limits the scope of exploitation to insiders or attackers who have already compromised a user account. Organizations relying on macOS devices, particularly in sectors like technology, finance, and government, could face increased risk if this vulnerability is not patched promptly. The absence of known exploits in the wild reduces immediate risk but does not eliminate the potential for future attacks once the vulnerability details become widely known.

To mitigate CVE-2025-43351, organizations and users should promptly update all affected macOS systems to macOS Tahoe 26.1 or later, where the vulnerability has been addressed with enhanced permission restrictions. Beyond patching, organizations should implement strict application control policies to limit the installation and execution of untrusted or unnecessary applications, reducing the risk of local exploitation. Employing endpoint detection and response (EDR) solutions can help identify suspicious local activities indicative of exploitation attempts. Regularly auditing user privileges and restricting local user permissions to the minimum necessary can further reduce the attack surface. Additionally, educating users about the risks of installing unverified software and maintaining strong physical security controls to prevent unauthorized local access are important complementary measures. Monitoring macOS security advisories for any updates or emerging exploit reports related to this vulnerability is also recommended.