CVE-2026-64701: Apple macOS Privilege Escalation Vulnerability

CVE-2026-64701 Overview

CVE-2026-64701 is a local privilege escalation vulnerability in Apple macOS caused by improper permission handling [CWE-280]. A malicious application running with limited privileges can exploit the flaw to gain root access on affected systems. Apple addressed the issue by applying additional restrictions in macOS Sequoia 15.7.8 and macOS Tahoe 26.6.

Critical Impact
A local attacker with the ability to run a malicious application can escalate privileges to root, obtaining full control over the affected macOS host.

Affected Products

Apple macOS versions prior to Sequoia 15.7.8
Apple macOS versions prior to Tahoe 26.6
Systems running unpatched macOS with unprivileged local code execution

Discovery Timeline

2026-09-14 - CVE-2026-64701 published to NVD
2026-09-15 - Last updated in NVD database

Technical Details for CVE-2026-64701

Vulnerability Analysis

CVE-2026-64701 stems from an improper preservation of permissions within a macOS component. The affected code path allowed a local, low-privileged process to perform an action whose effective permissions exceeded what the caller should have been granted. Apple's advisory describes the fix as adding restrictions to the permission checks that gate the privileged operation.

Successful exploitation grants the attacker root privileges. This provides full read, write, and execute access across the file system, the ability to load kernel extensions where permitted, and the capability to disable or tamper with security controls. The vulnerability requires local access and the ability to execute code as a standard user, but no user interaction is needed.

Root Cause

The issue maps to [CWE-280: Improper Handling of Insufficient Permissions or Privileges]. A privileged operation did not correctly validate that the caller held the required entitlements or ownership before executing. Apple's remediation notes describe the correction as "additional restrictions," indicating the fix tightens authorization checks around the affected privileged code path.

Attack Vector

Exploitation requires a local attacker to run a crafted application on the target macOS system. The malicious app invokes the vulnerable interface to trigger the flawed permission check and elevate its own process to root. Because user interaction is not required, the technique fits well into post-compromise workflows following initial access through phishing, drive-by download, or supply-chain delivery of a trojanized app.

No public proof-of-concept or in-the-wild exploitation has been reported. For technical specifics, see the Apple Support Article #128067 and Apple Support Article #128071.

Detection Methods for CVE-2026-64701

Indicators of Compromise

Unexpected processes running as root that were launched by user-owned parent processes
Creation or modification of files under /Library/LaunchDaemons/, /System/, or /private/var/root/ originating from non-administrative users
New setuid or setgid binaries appearing outside of Apple-signed installer flows
Unsigned or ad-hoc-signed applications making calls to privileged system services

Detection Strategies

Monitor for privilege transitions where a process spawned by a standard user unexpectedly executes with uid=0
Correlate Endpoint Security Framework (ESF) events for ES_EVENT_TYPE_NOTIFY_EXEC with unusual entitlement usage
Alert on modifications to system-protected directories by non-root parent processes
Track installation and execution of unsigned applications from user-writable locations such as ~/Downloads/ and /tmp/

Monitoring Recommendations

Enable macOS Unified Logging and forward com.apple.securityd and authd subsystem events to a central SIEM
Baseline legitimate privileged helpers on managed endpoints and alert on deviations
Review MDM-reported OS versions to confirm every managed Mac is on a patched build

How to Mitigate CVE-2026-64701

Immediate Actions Required

Upgrade all Macs on the Sequoia branch to macOS Sequoia 15.7.8 or later
Upgrade all Macs on the Tahoe branch to macOS Tahoe 26.6 or later
Inventory endpoints through MDM to identify any hosts still running vulnerable builds
Restrict installation of unsigned or notarization-bypassed applications on managed fleets

Patch Information

Apple released fixes in macOS Sequoia 15.7.8 and macOS Tahoe 26.6. Full remediation details are published in Apple Support Article #128067 and Apple Support Article #128071. Apply the vendor updates through Software Update or an MDM-managed deployment.

Workarounds

No vendor-supplied workaround exists; apply the security update as the primary mitigation
Limit local user accounts to non-administrative privileges to reduce the pool of accounts that can stage a malicious app
Enforce Gatekeeper and notarization requirements to block execution of untrusted binaries
Use application allow-listing to restrict which binaries can run from user-writable directories

bash

# Verify the installed macOS build meets the patched version
sw_vers -productVersion

# Trigger an OS software update check
sudo softwareupdate --list
sudo softwareupdate --install --all --restart