CVE-2025-43412: 
macOS vulnerability analysis and mitigation

CVE-2025-43412 is a file quarantine bypass vulnerability in Apple macOS that allows a sandboxed app to break out of its sandbox. It was discovered by Mickey Jin (@patch1t) and disclosed on November 3, 2025, as part of Apple's security updates for macOS Sonoma 14.8.2, macOS Sequoia 15.7.2, and macOS Tahoe 26.1. The vulnerability affects macOS Sonoma versions 14.0 through 14.8.2 (exclusive) and macOS Sequoia versions 15.0 through 15.7.2 (exclusive). It carries a CVSS v3.1 base score of 6.3 (Medium), as assessed by CISA-ADP (Apple Sequoia Advisory, Apple Sonoma Advisory, Apple Tahoe Advisory).

The vulnerability is classified under CWE-284 (Improper Access Control) and resides in the TCC (Transparency, Consent, and Control) subsystem of macOS, which governs app permissions and sandbox enforcement. The root cause is insufficient validation in the file quarantine mechanism, which macOS uses to flag and restrict files downloaded from the internet. An attacker with a low-privileged local app can exploit this bypass to escape the app sandbox without requiring user interaction, as the flaw allows the app to circumvent quarantine checks that would normally restrict its access. Apple addressed the issue by adding additional checks to the file quarantine handling logic (Apple Sequoia Advisory, Apple Sonoma Advisory).

Successful exploitation allows a sandboxed application to break out of its sandbox, potentially gaining access to files, data, and system resources that should be restricted. The CVSS assessment reflects low confidentiality, integrity, and availability impacts with a changed scope, indicating the vulnerability crosses the sandbox boundary into the broader system. This could enable a malicious app to access sensitive user data, modify protected files, or serve as a stepping stone for further privilege escalation on the affected macOS system (Apple Sequoia Advisory, Apple Sonoma Advisory).

No public proof-of-concept exploit code or evidence of in-the-wild exploitation has been reported for CVE-2025-43412. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. The EPSS score is approximately 0.018%, indicating a very low probability of exploitation in the near term. Exploitation requires local access and low privileges, limiting the attack surface compared to remote vulnerabilities (Apple Sonoma Advisory).

Apple has released patches addressing this vulnerability in macOS Sonoma 14.8.2, macOS Sequoia 15.7.2, and macOS Tahoe 26.1, all released on November 3, 2025. Users and administrators should update affected macOS systems to these versions or later as soon as possible. No configuration-based workarounds have been published by Apple; upgrading to a patched release is the only recommended remediation (Apple Sequoia Advisory, Apple Sonoma Advisory, Apple Tahoe Advisory).

The vulnerability was noted in the SANS Internet Storm Center diary covering the November 2025 Apple security updates, which highlighted the broad scope of fixes across macOS versions. The CIS Security advisory on multiple Apple vulnerabilities also referenced this update batch as addressing potential arbitrary code execution risks. No significant independent researcher commentary or social media discussion specific to CVE-2025-43412 has been identified beyond standard patch coverage (SANS ISC Diary, CIS Advisory).