CVE-2026-20622: Apple macOS Information Disclosure Flaw

CVE-2026-20622 Overview

A privacy vulnerability has been identified in Apple macOS affecting how temporary files are handled, which could allow a malicious application to capture a user's screen without proper authorization. This issue stems from improper access control (CWE-284) in the temporary file management system, enabling apps to bypass privacy protections and gain unauthorized access to screen capture functionality.

Critical Impact

Malicious applications may capture screen content without user consent, potentially exposing sensitive information including credentials, personal data, and confidential business information.

Affected Products

• Apple macOS (versions prior to Sequoia 15.7.4)
• Apple macOS (versions prior to Tahoe 26.3)

Discovery Timeline

• 2026-03-25 - CVE-2026-20622 published to NVD
• 2026-03-25 - Last updated in NVD database

Technical Details for CVE-2026-20622

Vulnerability Analysis

This vulnerability exploits weaknesses in macOS's temporary file handling mechanism, specifically related to improper access control (CWE-284). When macOS processes temporary files associated with screen capture functionality, insufficient permission validation allows unauthorized applications to intercept or capture screen content.

The attack can be executed remotely and requires no user interaction or special privileges to exploit. The impact is focused on confidentiality, as successful exploitation grants attackers the ability to capture screen content without user awareness or consent. This represents a significant privacy violation, particularly in enterprise environments where sensitive information may be displayed on screen.

Root Cause

The root cause of this vulnerability lies in the improper handling of temporary files used by macOS's screen capture subsystem. Specifically, the access control mechanisms fail to properly restrict which applications can interact with these temporary files, creating a pathway for malicious apps to bypass the normal privacy controls that should prevent unauthorized screen capture.

Attack Vector

The vulnerability can be exploited through network-based attack vectors with low complexity. An attacker would need to deliver a malicious application to the target system, which could then exploit the temporary file handling flaw to capture screen content. This could be accomplished through:

1. Social engineering users to install a seemingly legitimate application
2. Compromising an existing application to inject malicious screen capture code
3. Exploiting another vulnerability to gain initial code execution before leveraging this flaw

The vulnerability mechanism involves the malicious application accessing temporary files used by the screen capture system. Due to insufficient access control validation, the application can read or manipulate these files to obtain screen capture data. For detailed technical implementation, refer to Apple Support Document #126348.

Detection Methods for CVE-2026-20622

Indicators of Compromise

• Unexpected applications attempting to access screen capture-related APIs or temporary directories
• Unusual activity in /var/folders/ or other macOS temporary file locations related to screen capture
• Applications requesting screen recording permissions that were not explicitly installed by the user
• Anomalous network traffic patterns suggesting screen capture data exfiltration

Detection Strategies

• Monitor for unauthorized access attempts to macOS screen capture subsystems using endpoint detection tools
• Implement application allowlisting to prevent unauthorized applications from running
• Deploy behavioral analytics to detect applications exhibiting screen capture behavior without corresponding user permissions
• Review system logs for suspicious temporary file access patterns in screen capture-related directories

Monitoring Recommendations

• Enable enhanced logging for screen capture permission requests and temporary file access
• Configure SentinelOne Singularity Platform to alert on suspicious application behavior targeting privacy-sensitive system components
• Implement file integrity monitoring on critical macOS directories associated with screen capture functionality
• Regularly audit installed applications and their granted permissions

How to Mitigate CVE-2026-20622

Immediate Actions Required

• Update to macOS Sequoia 15.7.4 or macOS Tahoe 26.3 immediately
• Review installed applications and remove any untrusted or suspicious software
• Audit screen recording permissions in System Preferences > Privacy & Security > Screen Recording
• Restrict application installation to trusted sources only (Mac App Store or identified developers)

Patch Information

Apple has released security patches addressing this vulnerability in macOS Sequoia 15.7.4 and macOS Tahoe 26.3. Organizations should prioritize these updates given the privacy implications and the network-accessible attack vector.

For detailed patch information, refer to:

• Apple Support Document #126348
• Apple Support Document #126349

Workarounds

• Restrict application installation privileges to prevent users from installing untrusted software
• Implement network segmentation to limit potential attack vectors for delivering malicious applications
• Enable macOS Gatekeeper and ensure it is configured to only allow applications from the App Store and identified developers
• Consider deploying application control solutions to prevent unauthorized applications from executing

# Verify current macOS version
sw_vers -productVersion

# Check screen recording permissions via command line
sqlite3 ~/Library/Application\ Support/com.apple.TCC/TCC.db "SELECT client, allowed FROM access WHERE service='kTCCServiceScreenCapture';"

# List applications with screen recording access (requires admin)
tccutil reset ScreenCapture