CVE-2025-43461: 
macOS vulnerability analysis and mitigation

CVE-2025-43461 is a symlink validation vulnerability in Apple macOS affecting the configd component that allows a locally installed app to access protected user data. It affects all macOS versions prior to macOS Tahoe 26.1 and was fixed in that release on November 3, 2025. The CVE was published by Apple on December 12, 2025, and carries a CVSS v3.1 base score of 5.5 (Medium) (Apple Advisory, Feedly).

The root cause is classified as CWE-59 (Improper Link Resolution Before File Access, or 'Link Following'), meaning the configd daemon on macOS failed to properly validate symbolic links before accessing files, allowing an attacker-controlled app to redirect file operations to protected locations. An attacker with low-privileged local access could craft a malicious symlink that, when followed by configd, grants the app read access to protected user data without requiring user interaction. Apple addressed the issue with improved validation of symlinks in macOS Tahoe 26.1. The vulnerability was discovered and reported by Csaba Fitzl (@theevilbit) of Kandji (Apple Advisory, Feedly).

Successful exploitation allows a malicious application to bypass macOS privacy protections and read protected user data that would otherwise be inaccessible to the app. The impact is limited to confidentiality — there is no integrity or availability impact. While the scope is local and does not directly enable remote code execution or privilege escalation, unauthorized access to sensitive user data (such as contacts, messages, or other protected files) could facilitate further attacks or privacy violations (Apple Advisory, Feedly).

1. Preparation: Develop or obtain a macOS application that can be installed on the target system with standard (low-privileged) user permissions.
2. Symlink Creation: From within the app's accessible directory space, create a symbolic link pointing to a protected user data location (e.g., a directory or file protected by macOS TCC/privacy controls) that configd is expected to access.
3. Trigger configd Access: Cause configd to perform a file operation that follows the crafted symlink — for example, by triggering a network configuration change or system event that causes configd to read from the symlinked path.
4. Data Exfiltration: Because configd does not properly validate the symlink target, it accesses the protected file on behalf of the app, allowing the app to read the contents of the protected user data.
5. Exfiltrate or Abuse Data: The app reads and exfiltrates the accessed protected data, potentially exposing sensitive user information (Apple Advisory, Feedly).

• File System: Unexpected symbolic links in app-writable directories pointing to protected system or user data paths (e.g., ~/Library/, /private/var/, or TCC-protected locations).
• Logs: Unusual configd access log entries showing file reads from paths outside its expected operational scope; macOS Unified Log entries from configd referencing user data directories.
• Process: configd process accessing files in user data directories (e.g., Contacts, Messages, Photos) without a corresponding user-initiated action, observable via fs_usage or opensnoop system tools.
• Network: Unexpected outbound data transfers from apps shortly after configd activity, potentially indicating exfiltration of accessed user data.

Apple has released a patch in macOS Tahoe 26.1 (released November 3, 2025), which addresses the issue with improved symlink validation in configd. Users should update to macOS Tahoe 26.1 or later immediately. As a general precaution, only install applications from trusted sources (Mac App Store or verified developers), and review app permissions regularly via System Settings > Privacy & Security (Apple Advisory).

The vulnerability was reported by Csaba Fitzl (@theevilbit) of Kandji, a well-known macOS security researcher who also reported several other symlink-related issues in the same macOS Tahoe 26.1 release. The CIS Security advisory noted multiple vulnerabilities in Apple products patched in this release, including CVE-2025-43461 (CIS Advisory). The SANS Internet Storm Center also covered the macOS Tahoe 26.1 release (SANS ISC). Community reaction has been moderate given the medium severity rating and local-only attack vector.