CVE-2026-28877: Apple iPadOS Information Disclosure Flaw

CVE-2026-28877 Overview

CVE-2026-28877 is an authorization bypass vulnerability affecting multiple Apple operating systems that allows a malicious application to access sensitive user data. The vulnerability stems from improper state management in the authorization mechanism, which Apple has addressed with improved state management controls.

This authorization flaw affects the full ecosystem of Apple devices including iOS, iPadOS, macOS, visionOS, and watchOS. A locally installed application with low privileges can exploit this vulnerability to bypass authorization controls and gain unauthorized access to confidential user information without any user interaction.

Critical Impact

Malicious applications can bypass authorization mechanisms to access sensitive user data across all major Apple platforms, potentially exposing personal information, credentials, and private documents.

Affected Products

• Apple iOS 26.4 and earlier
• Apple iPadOS 26.4 and earlier
• Apple macOS Sequoia 15.7.5 and earlier / macOS Tahoe 26.4 and earlier
• Apple visionOS 26.4 and earlier
• Apple watchOS 26.4 and earlier

Discovery Timeline

• 2026-03-25 - CVE-2026-28877 published to NVD
• 2026-03-26 - Last updated in NVD database

Technical Details for CVE-2026-28877

Vulnerability Analysis

This vulnerability is classified under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor), indicating that the flaw allows unauthorized disclosure of confidential data. The authorization mechanism in affected Apple operating systems fails to properly validate application permissions due to a state management defect.

The vulnerability requires local access to the target device, meaning an attacker must first install a malicious application on the victim's device. Once installed, the application can exploit the improper state management to bypass authorization checks that would normally prevent access to protected user data. The confidentiality impact is significant, as successful exploitation grants complete read access to sensitive information.

Root Cause

The root cause is an authorization issue in how Apple's operating systems manage state during permission validation. When an application requests access to protected resources, the state management mechanism fails to properly track and enforce authorization decisions. This allows applications to manipulate their authorization state and gain access to data that should be restricted.

Apple's security bulletin indicates the fix involves "improved state management," suggesting the original implementation had race conditions or improper state transitions that could be exploited to elevate an application's access privileges beyond what was originally granted.

Attack Vector

The attack vector is local, requiring the adversary to have the ability to install and execute code on the target device. Attack scenarios include:

1. Malicious App Distribution: An attacker could distribute a seemingly legitimate application through unofficial channels or potentially through the App Store if it passes initial review
2. Social Engineering: Users could be tricked into installing the malicious application through phishing or deceptive marketing
3. Enterprise Deployment: In enterprise environments, a compromised MDM (Mobile Device Management) solution could push malicious applications to managed devices

Once the malicious application is installed and running, it can exploit the authorization bypass to access sensitive data including personal files, photos, contacts, location history, health data, and other protected information without triggering user-visible permission prompts.

Detection Methods for CVE-2026-28877

Indicators of Compromise

• Unusual application behavior requesting or accessing data outside its declared entitlements
• Applications accessing sensitive data types without corresponding permission prompts
• Suspicious inter-process communication patterns from third-party applications
• System logs showing authorization failures followed by successful data access

Detection Strategies

• Monitor application behavior for attempts to access protected data stores without proper entitlements
• Implement endpoint detection solutions capable of identifying authorization bypass attempts
• Review installed applications for unusual permission patterns or behaviors
• Enable comprehensive system logging to capture authorization events and anomalies

Monitoring Recommendations

• Deploy SentinelOne Singularity Platform on Apple devices to detect and respond to malicious application behavior
• Enable Apple's built-in security logging and review logs for unauthorized data access attempts
• Implement Mobile Threat Defense (MTD) solutions to identify potentially malicious applications
• Monitor for applications attempting to access sensitive APIs without user-visible permission requests

How to Mitigate CVE-2026-28877

Immediate Actions Required

• Update all Apple devices to the latest patched versions: iOS 26.4, iPadOS 26.4, macOS Sequoia 15.7.5, macOS Tahoe 26.4, visionOS 26.4, and watchOS 26.4
• Review installed applications and remove any untrusted or unnecessary third-party apps
• Enable automatic updates to ensure timely deployment of future security patches
• Implement application allowlisting in enterprise environments to prevent installation of unauthorized apps

Patch Information

Apple has released security patches addressing this vulnerability across all affected platforms. Organizations and users should apply these updates immediately:

• Apple Support Advisory 126792 - iOS and iPadOS security update
• Apple Support Advisory 126794 - macOS Sequoia security update
• Apple Support Advisory 126795 - macOS Tahoe security update
• Apple Support Advisory 126798 - visionOS security update
• Apple Support Advisory 126799 - watchOS security update

Workarounds

• Restrict application installations to only verified sources (Apple App Store)
• Enable device restrictions via MDM to limit installation of third-party applications
• Implement network-level controls to prevent sideloading of applications
• Consider using Lockdown Mode on iOS/iPadOS for high-risk users until patches can be applied

# iOS/macOS device management - verify current OS versions
# For macOS, check system version:
sw_vers -productVersion

# Enable automatic updates on macOS:
sudo softwareupdate --schedule on

# List installed applications for review:
ls -la /Applications/