CVE-2026-20680: Apple iPadOS Information Disclosure Flaw

CVE-2026-20680 Overview

CVE-2026-20680 is an information disclosure vulnerability affecting Apple iOS, iPadOS, and macOS. The flaw exists in the operating system's handling of app state observability. A sandboxed application can observe the state of other apps and access sensitive user data outside its intended sandbox boundary. Apple addressed the issue by adding additional restrictions on the observability of app states.

The vulnerability is classified under [CWE-200] (Exposure of Sensitive Information to an Unauthorized Actor). It affects multiple Apple platforms across both current and previous major OS versions.

Critical Impact
A sandboxed app may bypass intended isolation boundaries to access sensitive user data on affected Apple devices, undermining the security guarantees of the app sandbox.

Affected Products

Apple iOS and iPadOS versions prior to 18.7.5 and prior to 26.3
Apple macOS Sequoia prior to 15.7.4, macOS Sonoma prior to 14.8.4, and macOS Tahoe prior to 26.3
Devices running affected versions where third-party sandboxed apps can execute

Discovery Timeline

2026-02-11 - CVE-2026-20680 published to NVD
2026-04-02 - Last updated in NVD database

Technical Details for CVE-2026-20680

Vulnerability Analysis

The vulnerability resides in the macOS, iOS, and iPadOS app sandbox enforcement layer. Sandboxed applications on Apple platforms are restricted from observing or interacting with other processes and system state outside their entitlement scope. This flaw allowed a sandboxed app to observe app state information that should have been opaque to it. Through this observability, the app could infer or directly access sensitive user data belonging to other apps or the system. Apple's fix introduces additional restrictions on what app state information sandboxed processes can observe.

The issue is local in nature and requires the attacker to deliver or convince a user to install a sandboxed application. Once running, the malicious app can leverage the observable state to extract data without triggering standard permission prompts. The scope change in the CVSS vector indicates impact extends beyond the sandbox boundary into data owned by other security contexts.

Root Cause

The root cause is insufficient enforcement of sandbox boundaries around observable app state. The operating system exposed state metadata to sandboxed apps without adequately restricting what those apps could correlate or derive from it. This represents a classic information exposure weakness where indirect channels leak data the security model intended to protect.

Attack Vector

An attacker first delivers a sandboxed application to the target device through legitimate distribution channels or sideloading. The application requires only standard low-privilege sandbox execution. Once active, it queries observable app state surfaces exposed by the OS and reconstructs sensitive user data from the leaked signals. No user interaction beyond initial app launch is required.

No verified public proof-of-concept code is available for this issue. Refer to Apple's security advisories for technical context: Apple Security Advisory #126346, Apple Security Advisory #126347, Apple Security Advisory #126348, Apple Security Advisory #126349, and Apple Security Advisory #126350.

Detection Methods for CVE-2026-20680

Indicators of Compromise

Installed third-party applications on iOS, iPadOS, or macOS endpoints running OS versions prior to the patched releases.
Apps making unusual queries to OS state APIs or polling app lifecycle data outside expected functional needs.
Unexpected access patterns to user data containers shortly after launch of newly installed apps.

Detection Strategies

Inventory macOS endpoints to identify systems running pre-patch versions of Sequoia 15.7.4, Sonoma 14.8.4, or Tahoe 26.3.
Use mobile device management (MDM) to enumerate iOS and iPadOS devices below versions 18.7.5 and 26.3.
Review sandboxed app activity logs on macOS via the unified logging system for anomalous state observation calls.

Monitoring Recommendations

Track installation of unsigned or low-reputation apps on managed Apple devices.
Alert on macOS endpoints that remain on outdated OS builds beyond a defined patch window.
Correlate app launch telemetry with subsequent sensitive data container access events.

How to Mitigate CVE-2026-20680

Immediate Actions Required

Update iOS and iPadOS devices to version 18.7.5 or 26.3.
Update macOS systems to Sequoia 15.7.4, Sonoma 14.8.4, or Tahoe 26.3 as appropriate for the major OS branch.
Audit installed third-party applications and remove apps from untrusted sources.
Enforce update compliance through MDM policies for managed fleets.

Patch Information

Apple released fixes across multiple OS branches. The relevant patched versions are iOS 18.7.5, iPadOS 18.7.5, iOS 26.3, iPadOS 26.3, macOS Sequoia 15.7.4, macOS Sonoma 14.8.4, and macOS Tahoe 26.3. Patch details are published in the Apple Security Advisory #126346 and companion advisories.

Workarounds

Restrict installation of third-party apps on managed devices using MDM configuration profiles.
Limit App Store and sideloading capabilities on devices that cannot be immediately updated.
Enforce least-privilege app deployment policies until patching is complete.

bash

# Verify macOS version meets the patched baseline
sw_vers -productVersion

# On iOS/iPadOS, confirm version via Settings > General > About
# Required minimums: iOS/iPadOS 18.7.5 or 26.3
# Required minimums: macOS Sequoia 15.7.4, Sonoma 14.8.4, Tahoe 26.3