CVE-2026-28888 is a race condition vulnerability identified in Apple macOS that allows a local application to escalate privileges to root. The root cause is improper state handling during certain operations, which creates a timing window where an attacker-controlled app can manipulate system state to gain elevated privileges. This vulnerability is categorized under CWE-362 (Race Condition), indicating a flaw in concurrent process or thread management. The issue affects multiple macOS versions, including Sequoia 15.7.5, Sonoma 14.8.5, and Tahoe 26.4, and was addressed by Apple through improved state handling mechanisms to close the race window. The CVSS 3.1 score of 5.1 reflects a medium severity, with an attack vector limited to local access (AV:L), high attack complexity (AC:H), no privileges required (PR:N), and no user interaction (UI:N). The impact is primarily on availability, as indicated by the CVSS vector, with no direct confidentiality or integrity loss reported. No public exploits or active exploitation campaigns have been observed to date. The vulnerability underscores the importance of robust concurrency controls in operating system components to prevent privilege escalation.

If exploited, this vulnerability allows a local attacker or malicious application to gain root privileges on affected macOS systems. This can lead to complete system compromise, enabling attackers to install persistent malware, access sensitive data, modify system configurations, or disrupt system availability. The local attack vector limits exploitation to users or processes with some level of access to the system, but no authentication or user interaction is required, increasing risk in multi-user or shared environments. Organizations relying on macOS for critical infrastructure, development, or sensitive data processing face risks of unauthorized access and potential operational disruption. Although no known exploits exist currently, the presence of a race condition vulnerability with privilege escalation potential makes timely patching essential to prevent future exploitation. The medium severity rating reflects a balance between the difficulty of exploitation and the high impact of successful attacks.

1. Apply the official Apple patches for macOS Sequoia 15.7.5, Sonoma 14.8.5, and Tahoe 26.4 immediately to remediate the vulnerability. 2. Restrict local user permissions and limit installation of untrusted applications to reduce the attack surface. 3. Employ endpoint protection solutions capable of detecting anomalous privilege escalation attempts. 4. Monitor system logs for unusual process behavior or privilege escalations indicative of exploitation attempts. 5. Implement strict access controls and user account management policies, especially in multi-user environments. 6. Conduct regular security audits and vulnerability assessments on macOS systems to ensure timely detection of unpatched vulnerabilities. 7. Educate users about the risks of running unverified applications locally. 8. Consider application whitelisting to prevent unauthorized code execution. These steps go beyond generic patching by emphasizing proactive detection, access control, and user awareness to mitigate exploitation risks.