CVE-2026-28937: Apple macOS Information Disclosure Flaw

CVE-2026-28937 Overview

CVE-2026-28937 is an access control weakness in Apple macOS that allows a local application to access sensitive user data. Apple addressed the issue through improved state management in macOS Golden Gate 27. The flaw is categorized under [CWE-284] Improper Access Control and requires local access with user interaction to exploit.

The vulnerability affects the confidentiality of user data on impacted systems but does not permit modification or service disruption. Apple published the fix in its security advisory for macOS Golden Gate 27.

Critical Impact
A malicious application installed on a vulnerable macOS system can read sensitive user data that should be protected by macOS access controls.

Affected Products

Apple macOS versions prior to Golden Gate 27
Systems running third-party applications with local execution privileges
macOS endpoints where user interaction can be induced

Discovery Timeline

2026-09-14 - CVE-2026-28937 published to the National Vulnerability Database (NVD)
2026-09-17 - Last updated in NVD database

Technical Details for CVE-2026-28937

Vulnerability Analysis

The vulnerability stems from improper state management within a macOS component. When application state transitions are not correctly enforced, an app running locally can reach code paths that expose user data outside its authorized sandbox scope. Apple's advisory states the issue was resolved by tightening state management logic in macOS Golden Gate 27.

Exploitation requires the attacker to deliver or convince a user to run a malicious application. User interaction is required, which limits opportunistic exploitation but does not prevent targeted attacks using social engineering or trojanized software distribution.

Root Cause

The root cause is improper access control tied to inconsistent state handling, tracked as [CWE-284]. The affected component did not correctly validate authorization state across transitions, permitting an app to reach protected user data resources it should not access.

Attack Vector

An attacker must first place a malicious application on the target macOS host. The user must then trigger the application, at which point the app reaches the vulnerable code path and reads sensitive data. The attack does not traverse the network and does not require prior authentication. Refer to the Apple Support Article for vendor technical details.

Detection Methods for CVE-2026-28937

Indicators of Compromise

Unsigned or newly installed applications reading files in user data directories such as ~/Library, ~/Documents, or Keychain-adjacent paths
Processes accessing TCC-protected resources without corresponding user consent prompts
Applications with unexpected file read patterns immediately after first launch

Detection Strategies

Monitor endpoint telemetry for local processes performing bulk reads of user profile data outside their declared entitlements
Correlate application launch events with subsequent access to sensitive directories to identify anomalous data access patterns
Use behavioral analytics to flag applications whose runtime behavior diverges from their signed intent

Monitoring Recommendations

Enable macOS Endpoint Security framework auditing for file access events on sensitive user directories
Track installation of unsigned or ad-hoc signed applications across managed macOS fleets
Alert on processes that access protected user data shortly after code execution or user interaction events

How to Mitigate CVE-2026-28937

Immediate Actions Required

Upgrade all Apple macOS systems to macOS Golden Gate 27 or later
Audit installed third-party applications and remove any that are unsigned or from untrusted sources
Restrict installation privileges on managed macOS endpoints to reduce the attack surface

Patch Information

Apple resolved CVE-2026-28937 in macOS Golden Gate 27 through improved state management. Administrators should deploy the update through Software Update, MDM policies, or Apple Business Manager. Full details are available in the Apple Support Article.

Workarounds

Enforce Gatekeeper and require notarized applications through configuration profiles
Disable the ability for standard users to install applications outside of managed channels
Educate users to avoid launching untrusted applications, since exploitation requires user interaction

bash

# Verify current macOS version and enforce Gatekeeper on managed endpoints
sw_vers -productVersion
sudo spctl --master-enable
sudo defaults write /Library/Preferences/com.apple.SoftwareUpdate AutomaticallyInstallMacOSUpdates -bool true