CVE-2026-20624 is an injection vulnerability identified in Apple macOS that allows an application to bypass intended access controls and retrieve sensitive user data. The root cause is an injection issue due to insufficient input validation, categorized under CWE-863 (Incorrect Authorization). This flaw enables an app, potentially malicious or compromised, to escalate privileges in terms of data access without proper authorization checks. The vulnerability affects multiple macOS versions prior to the patched releases: Sequoia 15.7.4, Sonoma 14.8.4, and Tahoe 26.3. The CVSS v3.1 base score is 5.5 (medium severity), with an attack vector of local (AV:L), low attack complexity (AC:L), no privileges required (PR:N), but requiring user interaction (UI:R). The impact is high on confidentiality (C:H) but no impact on integrity (I:N) or availability (A:N). This means an attacker with local access and user interaction can exploit the vulnerability to access sensitive data without altering or disrupting system operations. No public exploits or active exploitation have been reported to date. The vulnerability was reserved in November 2025 and published in February 2026. Apple addressed the issue by improving validation mechanisms to prevent injection attacks that lead to unauthorized data access. This vulnerability highlights the importance of strict input validation and authorization checks in operating system components that handle sensitive user data.

The primary impact of CVE-2026-20624 is unauthorized access to sensitive user data on affected macOS systems. This can lead to privacy breaches, exposure of personal or corporate confidential information, and potential compliance violations for organizations handling regulated data. Since the vulnerability does not affect integrity or availability, it does not allow data modification or system disruption, but the confidentiality breach alone can have serious consequences, including identity theft, corporate espionage, or targeted attacks leveraging stolen data. The requirement for local access and user interaction limits remote exploitation but does not eliminate risk, especially in environments where users may be tricked into running malicious apps or scripts. Organizations with macOS endpoints, particularly those in sectors like finance, healthcare, and government, face increased risk if patches are not applied promptly. The absence of known exploits reduces immediate threat but does not preclude future exploitation attempts.

To mitigate CVE-2026-20624, organizations should: 1) Immediately deploy the security updates released by Apple for macOS Sequoia 15.7.4, Sonoma 14.8.4, and Tahoe 26.3 or later versions. 2) Restrict local user permissions to minimize the ability to install or run untrusted applications. 3) Implement application whitelisting and endpoint protection solutions that can detect or block suspicious app behaviors. 4) Educate users to avoid executing unknown or untrusted applications, especially those requesting elevated privileges or access to sensitive data. 5) Monitor system logs and endpoint telemetry for unusual access patterns or attempts to exploit local vulnerabilities. 6) Employ network segmentation to limit lateral movement if a local compromise occurs. 7) Regularly audit installed software and user privileges to ensure compliance with least privilege principles. These steps go beyond generic patching by focusing on reducing attack surface and improving detection capabilities.