CVE-2025-31244 is a vulnerability in Apple macOS that allows an application to bypass the file quarantine mechanism and escape its sandbox environment. The file quarantine feature is designed to restrict the execution of potentially unsafe files downloaded from the internet, preventing them from causing harm. This vulnerability arises due to insufficient checks in the quarantine enforcement, categorized under CWE-693 (Protection Mechanism Failure). An attacker with low privileges (PR:L) and no user interaction (UI:N) can exploit this flaw to escalate privileges and break out of the sandbox, gaining unauthorized access to system resources. The vulnerability has a CVSS v3.1 base score of 8.8, indicating high severity, with impacts rated high on confidentiality, integrity, and availability. The scope is changed (S:C), meaning the vulnerability affects components beyond the initially vulnerable component. The issue was addressed by Apple in macOS Sequoia 15.5 through additional validation checks that reinforce quarantine bypass protections. No public exploits are known at this time, but the vulnerability’s nature makes it a critical concern for macOS users. The vulnerability affects all macOS versions prior to 15.5, and exploitation requires local access but no user interaction, making it feasible for attackers with limited access to escalate privileges and compromise system security.

The impact of CVE-2025-31244 is significant for organizations worldwide using macOS systems. Successful exploitation allows an attacker to escape the sandbox, potentially gaining unauthorized access to sensitive data, system files, and other protected resources. This can lead to full system compromise, data breaches, and disruption of critical services. The high confidentiality, integrity, and availability impacts mean attackers could exfiltrate confidential information, modify or delete critical data, and disrupt system operations. Organizations relying on macOS for development, creative work, or critical infrastructure are at risk of targeted attacks leveraging this vulnerability. The ease of exploitation with low privileges and no user interaction increases the threat level, especially in environments where local access controls are weak or where insider threats exist. Although no known exploits are currently in the wild, the vulnerability’s presence in a widely used operating system makes it a prime target for attackers once exploit code becomes available.

1. Immediately update all macOS systems to version 15.5 or later, which contains the patch addressing this vulnerability. 2. Restrict local access to macOS systems by enforcing strong access controls, including multi-factor authentication and least privilege principles. 3. Monitor system logs and security tools for unusual sandbox escape attempts or suspicious application behaviors indicative of quarantine bypass. 4. Employ endpoint detection and response (EDR) solutions capable of detecting privilege escalation and sandbox breakout activities. 5. Educate users and administrators about the risks of running untrusted applications and downloading files from unverified sources. 6. Implement application whitelisting to limit execution to trusted software only. 7. Regularly audit and review macOS security configurations to ensure quarantine and sandbox protections are enabled and functioning correctly. 8. Consider network segmentation to limit the impact of compromised macOS endpoints within the organizational network.