CVE-2026-20607: Apple macOS Information Disclosure Flaw

CVE-2026-20607 Overview

A permissions vulnerability exists in Apple macOS that could allow a malicious application to access protected user data. The issue stems from improper permission restrictions within the operating system, which Apple has addressed by implementing additional restrictions in the affected components. This vulnerability requires local access to exploit and could result in unauthorized disclosure of sensitive user information.

Critical Impact

A malicious application running on an affected macOS system may be able to bypass permission controls and access protected user data, potentially exposing sensitive personal information.

Affected Products

• macOS Sequoia versions prior to 15.7.5
• macOS Sonoma versions prior to 14.8.5
• macOS Tahoe versions prior to 26.4

Discovery Timeline

• 2026-03-25 - CVE-2026-20607 published to NVD
• 2026-03-26 - Last updated in NVD database

Technical Details for CVE-2026-20607

Vulnerability Analysis

This vulnerability is classified under CWE-269 (Improper Privilege Management), indicating a flaw in how macOS manages privileges and permissions for applications attempting to access protected user data. The issue allows applications to circumvent intended access controls, potentially gaining unauthorized read access to sensitive user information that should be protected by the operating system's privacy mechanisms.

The vulnerability requires local access to exploit, meaning an attacker would need to either have physical access to the system or have already compromised the target through another means to deploy a malicious application. While the attack complexity is low and requires no special privileges to execute, the impact is limited to confidentiality exposure without the ability to modify or destroy data.

Root Cause

The root cause of this vulnerability lies in insufficient permission restrictions within macOS's data protection mechanisms. The operating system failed to properly enforce access controls when applications attempted to access protected user data areas. Apple addressed this by implementing additional restrictions to ensure that applications cannot bypass the intended permission boundaries.

Attack Vector

The attack vector for CVE-2026-20607 is local, requiring an attacker to execute a malicious application on the target macOS system. The exploitation scenario involves:

1. An attacker crafts a malicious macOS application designed to exploit the permissions flaw
2. The user is tricked into installing and running the malicious application (potentially through social engineering or bundled with seemingly legitimate software)
3. Once executed, the application leverages the insufficient permission restrictions to access protected user data
4. Sensitive user information is extracted and potentially exfiltrated to the attacker

The vulnerability can be exploited through a malicious application that takes advantage of the permission enforcement gaps in macOS. When the application requests access to protected data areas, the insufficient restrictions allow the read operation to succeed where it should have been denied. Technical details regarding the specific exploitation mechanism can be found in the Apple Support Advisory #126794.

Detection Methods for CVE-2026-20607

Indicators of Compromise

• Unusual application access attempts to protected user data directories such as ~/Library/, ~/Documents/, or other privacy-protected locations
• Applications requesting or accessing sensitive data without corresponding user consent dialogs
• Suspicious process activity from recently installed or unknown applications accessing TCC (Transparency, Consent, and Control) protected resources

Detection Strategies

• Monitor for unauthorized access attempts to protected user data directories using endpoint detection and response (EDR) solutions
• Implement application allowlisting to prevent unauthorized applications from executing on managed macOS systems
• Review system logs for unusual permission-related events and access patterns to protected resources
• Deploy SentinelOne Singularity Platform to detect anomalous application behavior and unauthorized data access attempts

Monitoring Recommendations

• Enable and monitor macOS Unified Logging for permission-related events and access control violations
• Configure alerts for new or unsigned applications attempting to access protected user data
• Regularly audit installed applications and their permission requests across managed macOS endpoints
• Monitor for applications bypassing TCC protections or accessing data outside their expected sandbox boundaries

How to Mitigate CVE-2026-20607

Immediate Actions Required

• Update all affected macOS systems to the patched versions immediately: macOS Sequoia 15.7.5, macOS Sonoma 14.8.5, or macOS Tahoe 26.4
• Review recently installed applications on macOS systems and remove any suspicious or unauthorized software
• Implement application allowlisting policies to restrict execution of unknown applications
• Enable SentinelOne endpoint protection to detect and block malicious applications attempting to exploit this vulnerability

Patch Information

Apple has released security updates to address this vulnerability. System administrators and users should apply the following updates as soon as possible:

Workarounds

• Restrict installation of applications to only those from the Mac App Store or identified developers via System Preferences > Security & Privacy
• Implement strict application control policies using MDM (Mobile Device Management) solutions to prevent unauthorized application installations
• Educate users about the risks of installing applications from untrusted sources and the importance of maintaining up-to-date systems
• Regularly backup sensitive user data to minimize potential impact if exploitation occurs before patching

# Check current macOS version
sw_vers -productVersion

# Force check for software updates
softwareupdate --list

# Install all available updates
sudo softwareupdate --install --all --restart