CVE-2026-20607 is a permissions-related vulnerability in Apple macOS that allows an application to access protected user data improperly. The root cause is a permissions misconfiguration or insufficient enforcement that permits apps to bypass intended access controls. This issue affects multiple macOS versions prior to the patched releases: macOS Sequoia 15.7.5, macOS Sonoma 14.8.5, and macOS Tahoe 26.4. The vulnerability does not require the app to have elevated privileges or user interaction, but it does require local access to the system. The CVSS v3.1 base score is 4.0 (medium), reflecting that the attack vector is local (AV:L), with low complexity (AC:L), no privileges required (PR:N), and no user interaction (UI:N). The impact is limited to confidentiality (C:L) with no integrity or availability impact. Apple mitigated the issue by adding additional restrictions to the permission model, preventing unauthorized apps from accessing protected user data. There are no known exploits in the wild, and no public proof-of-concept code has been reported. The vulnerability is categorized under CWE-269 (Improper Privilege Management), indicating a failure to correctly enforce access controls. This flaw could be exploited by malicious local users or malware to extract sensitive information from user accounts, potentially leading to privacy violations or data leakage.

The primary impact of CVE-2026-20607 is unauthorized access to protected user data, which compromises confidentiality. While the vulnerability does not affect data integrity or system availability, unauthorized data access can lead to privacy breaches, exposure of sensitive information, and potential escalation of attacks if the data includes credentials or personal identifiers. Organizations with macOS endpoints, especially those handling sensitive or regulated data, face risks of data leakage. Since exploitation requires local access but no privileges or user interaction, attackers with physical or remote access to user machines (e.g., through other malware or insider threats) could leverage this vulnerability to extract data stealthily. The absence of known exploits reduces immediate risk, but the medium severity rating and the widespread use of macOS in enterprise and government environments mean that timely patching is critical to prevent potential exploitation. Failure to remediate could result in compliance violations and reputational damage if sensitive user data is exposed.

To mitigate CVE-2026-20607, organizations should promptly update all affected macOS systems to the fixed versions: macOS Sequoia 15.7.5, macOS Sonoma 14.8.5, or macOS Tahoe 26.4. Beyond patching, organizations should enforce strict local access controls and limit user permissions to reduce the risk of unauthorized local code execution. Employ endpoint protection solutions that monitor for suspicious local application behavior and unauthorized data access attempts. Implement application whitelisting to restrict installation and execution of untrusted apps. Regularly audit installed applications and their permissions to detect anomalies. For environments with high security requirements, consider using macOS’s built-in privacy and security features such as System Integrity Protection (SIP) and Full Disk Encryption to protect data at rest and limit unauthorized access. Educate users about the risks of installing untrusted software and maintain strong physical security controls to prevent unauthorized local access. Finally, monitor security advisories from Apple for any updates or additional mitigations related to this vulnerability.