CVE-2026-28824: Apple macOS Auth Bypass Vulnerability

CVE-2026-28824 Overview

CVE-2026-28824 is an authorization bypass vulnerability affecting Apple macOS systems. The vulnerability stems from an improper state management issue in the authorization mechanism, which allows a malicious application to bypass security controls and access sensitive user data without proper permissions.

This vulnerability affects multiple macOS versions including Sequoia, Sonoma, and the upcoming Tahoe release. An attacker could exploit this flaw by crafting a malicious application that leverages the authorization state management weakness to gain unauthorized access to protected user information.

Critical Impact

Malicious applications may bypass macOS authorization controls to access sensitive user data including personal files, credentials, and other protected information stored on affected systems.

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-2026-28824 published to NVD
• 2026-03-25 - Last updated in NVD database

Technical Details for CVE-2026-28824

Vulnerability Analysis

CVE-2026-28824 represents an Improper Access Control vulnerability (CWE-284) within Apple macOS. The flaw exists in how the operating system handles authorization state transitions, allowing applications to operate outside their intended permission boundaries.

The authorization mechanism in macOS is designed to enforce strict access controls between applications and sensitive user data. However, a state management error in this implementation creates a race condition or logic flaw where an application can transition to an elevated authorization state without proper validation. This effectively bypasses the permission checks that would normally prevent unauthorized data access.

The vulnerability is exploitable over a network vector, meaning remote exploitation scenarios are possible when combined with other attack techniques such as phishing or social engineering to deliver a malicious application to the target system.

Root Cause

The root cause of CVE-2026-28824 lies in improper state management within the macOS authorization subsystem. Authorization decisions should be atomic and consistent, but the flawed implementation allows for state transitions that bypass the intended security checks. This is classified as CWE-284 (Improper Access Control), indicating that the access control mechanism fails to properly restrict actions to authorized entities.

The vulnerability likely stems from insufficient validation of authorization state transitions, where the system fails to verify that an application has legitimately obtained the necessary permissions before granting access to protected resources.

Attack Vector

The attack vector for CVE-2026-28824 involves a malicious application exploiting the authorization state management flaw. An attacker would need to:

1. Develop or modify an application to exploit the authorization bypass
2. Distribute the malicious application to target users (via phishing, malicious downloads, or compromised software distribution channels)
3. Once executed, the application leverages the state management vulnerability to access sensitive user data without triggering the expected authorization prompts

The vulnerability does not require any user interaction beyond initially running the malicious application, and no special privileges are required for exploitation.

Detection Methods for CVE-2026-28824

Indicators of Compromise

• Applications accessing protected user data directories (such as ~/Documents, ~/Desktop, ~/Downloads) without corresponding TCC (Transparency, Consent, and Control) database entries
• Unusual file access patterns from applications that should not have access to sensitive directories
• System log entries showing authorization state anomalies or unexpected permission grants
• Applications attempting to read keychain items, contacts, calendars, or photos without user-visible permission prompts

Detection Strategies

• Monitor TCC.db entries and compare against actual application behavior to identify discrepancies
• Implement endpoint detection rules to flag applications accessing sensitive directories without proper entitlements
• Review system logs for authorization-related errors or unexpected state changes using log show --predicate 'subsystem == "com.apple.TCC"'
• Deploy behavioral analysis to detect applications exhibiting data exfiltration patterns

Monitoring Recommendations

• Enable unified logging for authorization and TCC subsystems on all macOS endpoints
• Implement file integrity monitoring for sensitive user directories
• Configure alerts for applications accessing multiple sensitive data categories in rapid succession
• Utilize SentinelOne Singularity Platform to monitor application behavior and detect authorization bypass attempts in real-time

How to Mitigate CVE-2026-28824

Immediate Actions Required

• Update macOS Sequoia to version 15.7.5 or later immediately
• Update macOS Sonoma to version 14.8.5 or later immediately
• Update macOS Tahoe to version 26.4 or later immediately
• Audit recently installed applications for suspicious behavior or unknown origins
• Review and restrict application permissions in System Preferences > Security & Privacy > Privacy

Patch Information

Apple has released security patches addressing this vulnerability across all affected macOS versions. Organizations should prioritize patching as this vulnerability allows unauthorized access to sensitive user data.

Workarounds

• Restrict application installations to only those from the Mac App Store or identified developers via Gatekeeper settings
• Enable Full Disk Access restrictions and audit which applications have been granted elevated permissions
• Implement application allowlisting to prevent unauthorized applications from executing
• Use Mobile Device Management (MDM) solutions to enforce security policies and restrict potentially malicious application installation

# Check current macOS version
sw_vers -productVersion

# List applications with Full Disk Access (requires admin)
tccutil reset All

# Review TCC database for suspicious entries
sqlite3 ~/Library/Application\ Support/com.apple.TCC/TCC.db "SELECT * FROM access;"

# Enable stricter Gatekeeper settings
sudo spctl --master-enable