CVE-2026-28988: Apple iPadOS Auth Bypass Vulnerability

CVE-2026-28988 Overview

CVE-2026-28988 is a permissions weakness affecting multiple Apple operating systems. The flaw allows a locally installed application to bypass certain Privacy preferences enforced by the operating system. Apple addressed the issue by adding additional restrictions to the affected component.

The vulnerability is classified under CWE-284: Improper Access Control. Exploitation requires local access and low privileges, but no user interaction. Successful exploitation can expose data protected by Privacy controls such as user files, location data, or other restricted resources.

Critical Impact

A malicious app installed on an Apple device can bypass Privacy preferences and access user data the operating system was expected to protect.

Affected Products

• Apple iOS and iPadOS prior to 26.5
• Apple macOS Tahoe prior to 26.5
• Apple visionOS prior to 26.5 and watchOS prior to 26.5

Discovery Timeline

• 2026-05-11 - CVE-2026-28988 published to the National Vulnerability Database
• 2026-05-13 - Last updated in NVD database

Technical Details for CVE-2026-28988

Vulnerability Analysis

The vulnerability stems from an improper access control condition [CWE-284] in the Privacy enforcement layer used across Apple's operating systems. An application running with normal user privileges can reach a code path that does not consistently apply the Privacy preference checks. As a result, the app obtains access to resources or data that should require explicit user consent through the Privacy framework.

The issue affects iOS, iPadOS, macOS Tahoe, visionOS, and watchOS, indicating the flawed permission logic exists in a shared platform component. Apple's advisories describe the fix as additional restrictions on the affected operation, which suggests the original check was either missing, evaluated too late, or scoped incorrectly.

The impact is confidentiality-focused. The CVSS vector indicates no impact to integrity or availability, but high impact to confidentiality, consistent with disclosure of Privacy-protected information.

Root Cause

The root cause is an insufficient permission check around resources gated by Apple's Privacy preferences. The original logic did not fully constrain which callers could reach the protected operation, leaving a bypass path available to a locally running app.

Attack Vector

An attacker must first achieve local code execution, typically by convincing a user to install a malicious or repackaged application. Once running, the app invokes the affected code path to read or query data normally gated by Privacy preferences. No additional user interaction and no elevated entitlements are required.

No public proof-of-concept or exploit code is available for CVE-2026-28988. See the Apple Security Advisory for vendor-supplied technical details.

Detection Methods for CVE-2026-28988

Indicators of Compromise

• Applications accessing Privacy-protected resources (Contacts, Photos, Location, Files) without a corresponding TCC prompt or consent record on macOS.
• Unsigned or recently installed third-party apps making sustained reads of user data shortly after launch.
• Unexpected entries in TCC.db access logs or system telemetry showing access without matching user-grant events.

Detection Strategies

• Inventory Apple endpoints and compare installed OS builds against patched versions (iOS/iPadOS 26.5, macOS Tahoe 26.5, visionOS 26.5, watchOS 26.5).
• Monitor MDM compliance reports for devices that remain on pre-26.5 builds.
• Review application install telemetry for unsigned or sideloaded apps that request access to multiple Privacy-protected data classes.

Monitoring Recommendations

• Forward macOS Unified Log entries related to tccd and Privacy framework events to your central log platform for review.
• Alert on processes reading user data directories without a prior TCC authorization event.
• Track app behavior baselines and flag deviations such as new background access to Photos, Contacts, or Location services.

How to Mitigate CVE-2026-28988

Immediate Actions Required

• Update affected devices to iOS 26.5, iPadOS 26.5, macOS Tahoe 26.5, visionOS 26.5, and watchOS 26.5.
• Enforce minimum OS version policies through your MDM solution to block enrollment of unpatched devices.
• Audit installed third-party applications and remove any that are unsigned, unused, or from untrusted developers.

Patch Information

Apple has released fixes in iOS 26.5, iPadOS 26.5, macOS Tahoe 26.5, visionOS 26.5, and watchOS 26.5. Reference the vendor bulletins: Apple Security Advisory 127110, Apple Security Advisory 127115, Apple Security Advisory 127119, and Apple Security Advisory 127120.

Workarounds

• Restrict app installation sources to the App Store and vetted enterprise distribution channels until devices are patched.
• Review and tighten Privacy preference grants for installed applications, revoking access where not strictly required.
• Use MDM configuration profiles to limit installation of unmanaged applications on managed devices.

# Verify the installed macOS version on a managed endpoint
sw_vers -productVersion

# Example MDM query to list devices below the patched build
# (pseudocode - adapt to your MDM platform's query language)
Devices where osVersion < "26.5"