CVE-2026-20645: iOS/iPadOS Information Disclosure Flaw

CVE-2026-20645 Overview

CVE-2026-20645 is an inconsistent user interface vulnerability in Apple iOS and iPadOS that stems from improper state management. This flaw allows an attacker with physical access to a locked device to potentially view sensitive user information. The vulnerability was addressed through improved state management in the affected iOS and iPadOS versions.

Critical Impact

Physical access to a locked iOS or iPadOS device may allow unauthorized viewing of sensitive user information due to UI inconsistency issues.

Affected Products

• iOS 26.3 (versions prior to fix)
• iPadOS 26.3 (versions prior to fix)
• iOS 18.7.5 (versions prior to fix)
• iPadOS 18.7.5 (versions prior to fix)

Discovery Timeline

• 2026-02-11 - CVE-2026-20645 published to NVD
• 2026-02-12 - Last updated in NVD database

Technical Details for CVE-2026-20645

Vulnerability Analysis

This vulnerability is classified under CWE-1021 (Improper Restriction of Rendered UI Layers or Frames), which relates to issues where the user interface fails to properly restrict what content is displayed or accessible under certain conditions. In this case, the iOS and iPadOS user interface exhibits inconsistent behavior during state transitions, potentially allowing information to be exposed on the lock screen or through other UI elements when the device should be secured.

The attack requires physical access to the device, meaning an attacker must have the target device in their possession. While this limits the attack surface compared to remote vulnerabilities, it poses a significant risk in scenarios involving device theft, unattended devices, or targeted attacks where physical proximity is achievable.

Root Cause

The root cause of CVE-2026-20645 lies in improper state management within the iOS/iPadOS user interface framework. When transitioning between different UI states (such as locked to unlocked, or between applications), the system failed to consistently enforce visibility restrictions on sensitive information. This inconsistency in state handling allowed certain user data to remain visible or accessible when it should have been protected by the device's lock screen security measures.

Attack Vector

The attack vector for this vulnerability requires physical access to the target device. An attacker with hands-on access to a locked iPhone or iPad could potentially exploit the UI state management flaw to view sensitive user information without authenticating to the device. The specific exploitation technique would involve manipulating the device's UI state through physical interaction to trigger the inconsistent behavior.

Since no verified proof-of-concept code is publicly available, the exact exploitation method has not been disclosed. For technical details on the vulnerability and patches, refer to Apple Support Document #126346 and Apple Support Document #126347.

Detection Methods for CVE-2026-20645

Indicators of Compromise

• Unexpected UI behavior observed on locked devices, such as notifications or content displaying when they should be hidden
• Users reporting that sensitive information was visible without device authentication
• Device logs showing unusual state transitions or UI rendering events during lock screen periods

Detection Strategies

• Monitor device management solutions for iOS/iPadOS devices running vulnerable versions (prior to iOS 26.3, iPadOS 26.3, iOS 18.7.5, iPadOS 18.7.5)
• Implement mobile device management (MDM) policies to track and report on device OS version compliance
• Review physical access logs and security camera footage in environments where sensitive devices are used

Monitoring Recommendations

• Deploy SentinelOne Singularity Mobile to detect and inventory vulnerable iOS and iPadOS devices across the organization
• Configure alerts for devices that have not been updated to patched versions within the remediation window
• Establish baseline device version reporting to quickly identify non-compliant devices

How to Mitigate CVE-2026-20645

Immediate Actions Required

• Update all affected iOS devices to iOS 26.3 or iOS 18.7.5 immediately
• Update all affected iPadOS devices to iPadOS 26.3 or iPadOS 18.7.5 immediately
• Ensure devices containing sensitive information are physically secured and not left unattended
• Review and enforce MDM policies requiring minimum OS versions

Patch Information

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

• iOS 26.3 and iPadOS 26.3
• iOS 18.7.5 and iPadOS 18.7.5

For detailed patch information and update instructions, refer to Apple Support Document #126346 and Apple Support Document #126347.

Workarounds

• Implement strict physical security controls for devices that cannot be immediately patched
• Enable Find My iPhone/iPad to remotely wipe devices if they are lost or stolen
• Review lock screen notification settings to minimize sensitive information displayed on the lock screen
• Consider temporary restrictions on sensitive data access for unpatched devices until updates can be applied

# MDM Configuration - Enforce minimum OS version compliance
# Configure in your MDM solution to require patched versions
# iOS minimum version: 18.7.5 or 26.3
# iPadOS minimum version: 18.7.5 or 26.3