CVE-2026-28816 is a vulnerability in Apple macOS involving improper path handling that allows an application to delete files for which it lacks permission. The root cause is a path traversal weakness (CWE-22), where insufficient validation of file paths enables an app to bypass normal access controls. This flaw was fixed by Apple in macOS Sequoia 15.7.5, Sonoma 14.8.5, and Tahoe 26.4 through enhanced path validation mechanisms. The vulnerability can be exploited locally without requiring any privileges or user interaction, making it accessible to any app running on the system. While the vulnerability does not expose confidential information or cause denial of service, it undermines file integrity by permitting unauthorized deletion of files, which could disrupt applications or user data. The CVSS vector (AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N) reflects a local attack vector with low complexity, no privileges or user interaction needed, and limited impact confined to integrity. No public exploits or active exploitation have been reported to date. This vulnerability is particularly relevant for organizations and users running affected macOS versions, especially those with sensitive or critical data stored on local file systems. The fix involves applying the latest macOS updates that include improved path validation to prevent unauthorized file deletions.

The primary impact of CVE-2026-28816 is unauthorized deletion of files by applications without proper permissions, which compromises data integrity. This can lead to loss of critical files, disruption of applications, and potential operational issues. Although confidentiality and availability are not directly affected, the integrity breach can cause cascading effects such as corrupted workflows, loss of audit trails, or disruption of services relying on the deleted files. Since exploitation requires local access but no privileges or user interaction, any malicious or compromised app on the system could abuse this vulnerability. Organizations with macOS endpoints, especially in environments where data integrity is critical (e.g., software development, content creation, or sensitive data processing), face increased risk. The absence of known exploits reduces immediate threat but does not eliminate risk, as attackers could develop exploits given the low complexity. Failure to patch could expose organizations to insider threats or malware leveraging this flaw to escalate damage.

1. Apply the official Apple patches by upgrading to macOS Sequoia 15.7.5, Sonoma 14.8.5, or Tahoe 26.4 or later versions that include the fix. 2. Restrict installation of untrusted or unsigned applications to reduce the risk of malicious apps exploiting this vulnerability. 3. Employ endpoint protection solutions that monitor and restrict unauthorized file system modifications, especially deletions. 4. Implement application whitelisting and sandboxing to limit the capabilities of apps and contain potential abuse. 5. Regularly audit file system integrity and maintain backups to recover from unauthorized deletions. 6. Educate users and administrators about the risks of running unknown or untrusted software on macOS devices. 7. Monitor system logs for unusual file deletion activities that could indicate exploitation attempts. These measures combined reduce the attack surface and improve detection and response capabilities beyond simply patching.