CVE-2026-43756 Overview
CVE-2026-43756 is a logic flaw in Apple macOS that allows a local application to access user-sensitive data. Apple addressed the issue through improved validation across three macOS release trains. The vulnerability is classified under [CWE-200] (Exposure of Sensitive Information to an Unauthorized Actor) and requires local access with user interaction to exploit. Apple fixed the issue in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6.
Critical Impact
A locally installed application can bypass validation checks and read user-sensitive data without proper authorization on unpatched macOS systems.
Affected Products
- Apple macOS Sequoia versions prior to 15.7.8
- Apple macOS Sonoma versions prior to 14.8.8
- Apple macOS Tahoe versions prior to 26.6
Discovery Timeline
- 2026-07-27 - CVE-2026-43756 published to NVD
- 2026-07-28 - Last updated in NVD database
Technical Details for CVE-2026-43756
Vulnerability Analysis
The vulnerability is an information disclosure issue rooted in insufficient validation logic within a macOS component. An application running on the local system can leverage the flawed logic path to reach data it is not authorized to access. Exploitation requires user interaction, which typically means the target must launch or interact with the malicious application.
The scope of exposed data is described by Apple as user-sensitive data, which on macOS typically covers items protected by Transparency, Consent, and Control (TCC) or comparable privacy boundaries. Integrity and availability are not affected, which aligns with an information disclosure classification rather than tampering or denial of service.
Root Cause
Apple's advisory states the fix was implemented through improved validation. The underlying defect is a logic issue in which validation checks either failed to run for a specific code path or accepted inputs and states that should have been rejected. As a result, the affected component returned or exposed protected data without confirming the requesting process held the necessary entitlements or user consent.
Attack Vector
Exploitation requires local code execution in the form of an installed or executed application, combined with user interaction. A malicious or malicious-turned app distributed through phishing, sideloading, or a compromised update channel is the most plausible delivery path. Remote or network-based exploitation is not applicable based on the described attack surface.
No verified proof-of-concept code is publicly available. See the Apple Support Article 128067, Apple Support Article 128071, and Apple Support Article 128072 for the vendor's technical description.
Detection Methods for CVE-2026-43756
Indicators of Compromise
- Unexpected access attempts to TCC-protected directories such as ~/Library/, ~/Documents/, or ~/Library/Application Support/ by non-system processes.
- Applications launching without corresponding user-driven activity in unified logs or ExecPolicy events.
- Installation of unsigned or ad-hoc signed applications from outside the Mac App Store or notarized developer sources.
Detection Strategies
- Monitor macOS Endpoint Security Framework (ESF) events for processes reading privacy-scoped paths without a matching user prompt.
- Correlate application execution telemetry with the currently installed macOS build number to identify unpatched hosts running suspicious binaries.
- Alert on new or unknown processes making calls into privacy-sensitive frameworks shortly after user interaction with an installer or archive.
Monitoring Recommendations
- Inventory macOS endpoint versions using MDM (Jamf, Kandji, Intune) and flag hosts below the patched builds.
- Enable and centrally collect Unified Logging streams for tccd, sandboxd, and syspolicyd.
- Track application installation and first-execution events in your EDR data lake to establish baselines for anomaly detection.
How to Mitigate CVE-2026-43756
Immediate Actions Required
- Update all Apple macOS endpoints to macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, or macOS Tahoe 26.6.
- Restrict installation of unsigned or non-notarized applications through MDM policy and Gatekeeper configuration.
- Audit installed applications for unknown or recently added software that requests broad privacy entitlements.
Patch Information
Apple released fixes for CVE-2026-43756 in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6. Refer to Apple Support Article 128067, Apple Support Article 128071, and Apple Support Article 128072 for release-specific details. Apply the updates through Software Update or your MDM patch workflow.
Workarounds
- Enforce Gatekeeper and require notarized applications through configuration profiles until patches are deployed.
- Limit local user privileges and remove administrator rights from standard user accounts to reduce the blast radius of a malicious app.
- Use MDM to deny installation of applications outside an approved allowlist on high-risk endpoints.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
