CVE-2025-43396: 
macOS vulnerability analysis and mitigation

CVE-2025-43396 is a logic issue in the macOS Installer component that allows a sandboxed app to access sensitive user data. It was disclosed by Apple on November 3, 2025, and affects macOS Sonoma versions 14.0 through 14.8.2 (exclusive) and macOS Sequoia versions 15.0 through 15.7.2 (exclusive); macOS Tahoe 26.1 is also affected and patched. The vulnerability was reported by an anonymous researcher and carries a CVSS v3.1 base score of 5.5 (Medium) (Apple Sequoia Advisory, Apple Sonoma Advisory, Apple Tahoe Advisory).

The vulnerability is classified as CWE-284 (Improper Access Control) and stems from a logic issue in the macOS Installer component that fails to properly enforce sandbox restrictions. A sandboxed application can exploit this flaw to bypass access controls and read sensitive user data that should be inaccessible within the sandbox boundary. Exploitation requires local access and user interaction (e.g., a user running a malicious or compromised app), but no special privileges are needed. Apple addressed the issue by implementing improved checks in the affected component (Apple Sequoia Advisory, Apple Sonoma Advisory).

Successful exploitation allows a sandboxed macOS application to access sensitive user data outside its permitted sandbox scope, resulting in a high confidentiality impact. There is no integrity or availability impact — the vulnerability is limited to unauthorized data read access. The affected asset scope is unchanged (limited to the local system), but the exposure of sensitive user data could include personal files, credentials, or other protected information accessible through the Installer component (Apple Sequoia Advisory, Apple Sonoma Advisory).

There is no public proof-of-concept exploit and no evidence of in-the-wild exploitation as of the time of reporting. 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 user interaction, further limiting the practical attack surface (Apple Sequoia Advisory, 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 should update their macOS installations to these versions or later as the primary remediation. As interim measures, administrators should limit application permissions, enforce strict sandbox configurations, and avoid running untrusted local applications (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 also published an advisory noting multiple vulnerabilities in Apple products patched in this release cycle. No significant individual researcher commentary or social media discussion specific to CVE-2025-43396 has been identified beyond standard patch-cycle coverage.