CVE-2026-28831: Apple macOS Information Disclosure Flaw

CVE-2026-28831 Overview

CVE-2026-28831 is an authorization bypass vulnerability in Apple macOS that allows a malicious application to access sensitive user data. The vulnerability stems from improper state management in the authorization system, which was addressed by Apple through improved state handling mechanisms. This flaw affects multiple versions of macOS including Sequoia, Sonoma, and Tahoe.

Critical Impact

A locally installed malicious application can bypass authorization controls to access sensitive user data, potentially exposing personal information, credentials, or other confidential data stored on the system.

Affected Products

• Apple macOS Sequoia (versions prior to 15.7.5)
• Apple macOS Sonoma (versions prior to 14.8.5)
• Apple macOS Tahoe (versions prior to 26.4)

Discovery Timeline

• 2026-03-25 - CVE-2026-28831 published to NVD
• 2026-03-26 - Last updated in NVD database

Technical Details for CVE-2026-28831

Vulnerability Analysis

This authorization bypass vulnerability exists due to improper state management within macOS's authorization framework. The vulnerability requires local access and low-privilege user permissions to exploit, but it can result in the exposure of highly confidential user data without requiring any user interaction.

The flaw allows an application running on an affected macOS system to circumvent the normal authorization checks that protect sensitive user data. Under normal circumstances, applications must request explicit permission to access protected resources such as contacts, photos, location data, and other personal information. This vulnerability enables a malicious app to bypass these protective controls entirely.

The impact is primarily on data confidentiality, as an attacker could extract sensitive information from the compromised system. While the vulnerability does not allow system modification or denial of service, the potential for data theft makes it a significant concern for enterprise and personal users alike.

Root Cause

The root cause of CVE-2026-28831 lies in improper state management within macOS's authorization subsystem. Authorization frameworks typically maintain state information to track which applications have been granted permissions and under what circumstances those permissions apply. When state transitions are not handled correctly, an application may be able to exploit timing or state inconsistencies to gain unauthorized access.

Apple addressed this issue by implementing improved state management, ensuring that authorization decisions are made based on accurate and consistent state information throughout the permission verification process.

Attack Vector

This vulnerability requires local access to the target system. An attacker would need to install a malicious application on the victim's macOS device, which could be accomplished through:

• Social engineering users to download and install a trojanized application
• Compromising legitimate software distribution channels
• Exploiting other vulnerabilities to gain initial access before deploying the malicious payload

Once the malicious application is running on the system with standard user privileges, it can exploit the authorization state management flaw to access protected user data without triggering the normal permission dialogs or authorization checks that would alert the user.

The attack does not require elevated privileges beyond those of a normal local user, and no user interaction is needed once the malicious application is executing on the system.

Detection Methods for CVE-2026-28831

Indicators of Compromise

• Unexpected applications accessing protected data categories (Contacts, Photos, Calendar, etc.) without corresponding TCC (Transparency, Consent, and Control) entries
• Unusual process activity involving authorization framework components
• Applications attempting to access sensitive user data directories outside normal operational patterns

Detection Strategies

• Monitor TCC database (/Library/Application Support/com.apple.TCC/TCC.db and ~/Library/Application Support/com.apple.TCC/TCC.db) for unauthorized modifications or access patterns
• Implement endpoint detection rules to identify applications accessing protected data without corresponding user consent records
• Use behavioral analysis to detect applications exhibiting data exfiltration patterns after accessing authorization-protected resources

Monitoring Recommendations

• Enable comprehensive endpoint logging on macOS systems to capture application behavior and data access patterns
• Deploy SentinelOne agents on macOS endpoints for real-time behavioral monitoring and threat detection
• Monitor for suspicious application installations and execution from non-standard locations
• Implement data loss prevention controls to detect unusual outbound data transfers

How to Mitigate CVE-2026-28831

Immediate Actions Required

• Update all macOS Sequoia systems to version 15.7.5 or later immediately
• Update all macOS Sonoma systems to version 14.8.5 or later immediately
• Update all macOS Tahoe systems to version 26.4 or later immediately
• Audit installed applications and remove any untrusted or unknown software

Patch Information

Apple has released security updates that address this vulnerability through improved state management in the authorization framework. The patches are available through the following Apple Support Documents:

• Apple Support Document #126794 - macOS Sequoia 15.7.5
• Apple Support Document #126795 - macOS Sonoma 14.8.5
• Apple Support Document #126796 - macOS Tahoe 26.4

Organizations should prioritize deployment of these updates across their macOS fleet, particularly on systems that handle sensitive data or are used in high-security environments.

Workarounds

• Restrict application installations to only Apple-signed or notarized applications through Gatekeeper settings
• Implement application allowlisting policies to prevent unauthorized applications from executing
• Enhance monitoring of sensitive data access until patches can be applied
• Consider isolating systems that cannot be immediately patched from sensitive data resources

# Verify macOS version to ensure patched versions are installed
sw_vers -productVersion

# Check current Gatekeeper settings
spctl --status

# Enable Gatekeeper if disabled (requires admin privileges)
sudo spctl --master-enable

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