CVE-2026-65381: Apple macOS Privilege Escalation Vulnerability

CVE-2026-65381 Overview

CVE-2026-65381 is a sandbox escape vulnerability in Apple macOS caused by improper validation of process entitlements. A malicious application can bypass sandbox restrictions and gain access to resources outside its authorized scope. Apple addressed the flaw by improving entitlement verification checks in the operating system.

The issue affects multiple macOS versions and is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7. The weakness is classified under [CWE-862] Missing Authorization.

Critical Impact
A malicious app can break out of its sandbox, gaining unauthorized access to user data, system resources, and privileged APIs normally blocked by macOS sandbox policy.

Affected Products

Apple macOS versions prior to Golden Gate 27
Apple macOS versions prior to Sequoia 15.8
Apple macOS versions prior to Tahoe 26.7

Discovery Timeline

2026-09-14 - CVE-2026-65381 published to the National Vulnerability Database (NVD)
2026-09-17 - Last updated in NVD database

Technical Details for CVE-2026-65381

Vulnerability Analysis

The vulnerability resides in the entitlement verification logic that macOS uses to enforce sandbox boundaries. Entitlements are cryptographically signed key-value pairs that grant applications specific privileges. When these entitlements are not fully validated at runtime, a process can present or reference entitlements it does not legitimately possess.

A malicious application exploiting this flaw can escape the App Sandbox and interact with system components or user data outside its declared scope. This undermines a core macOS security boundary designed to contain untrusted or compromised applications.

The issue is mapped to [CWE-862] Missing Authorization, indicating the affected code path failed to properly verify that a process was authorized for the entitlement it claimed.

Root Cause

The root cause is insufficient validation of process entitlements during privilege checks. Apple's advisory states the fix introduces improved validation of the process entitlement, indicating the previous logic accepted entitlement claims without adequately verifying their provenance or applicability to the calling process.

Attack Vector

Exploitation requires a malicious application to run on the target macOS system. Once executed, the application invokes the vulnerable code path to bypass sandbox enforcement. No verified public exploit or proof-of-concept has been published at the time of writing, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

No verified proof-of-concept code is publicly available. Refer to the Apple Support Advisory #149035, Apple Support Advisory #149042, and Apple Support Advisory #149043 for vendor technical details.

Detection Methods for CVE-2026-65381

Indicators of Compromise

Unsigned or ad-hoc-signed applications making entitlement-gated system calls outside their declared sandbox scope
Unexpected process access to protected directories such as ~/Library, ~/Documents, or Transparency, Consent, and Control (TCC) protected paths from sandboxed apps
Applications spawning helper processes with entitlements inconsistent with their code signature

Detection Strategies

Monitor macOS Endpoint Security framework events for ES_EVENT_TYPE_NOTIFY_EXEC and correlate process entitlement claims against expected code-signing information
Audit codesign -d --entitlements output for installed applications and flag mismatches against known-good baselines
Alert on sandboxed applications performing operations that require entitlements they should not possess, such as arbitrary file system access or IPC with system daemons

Monitoring Recommendations

Enable unified logging subsystems com.apple.sandbox and com.apple.securityd and forward logs to a centralized analytics platform
Track macOS version distribution across managed endpoints to identify hosts running unpatched builds
Baseline normal parent-child process relationships for App Store and notarized applications to detect anomalous escape behaviors

How to Mitigate CVE-2026-65381

Immediate Actions Required

Update all macOS endpoints to Golden Gate 27, Sequoia 15.8, or Tahoe 26.7 as applicable to the installed major version
Prioritize patching on systems that install applications from outside the Mac App Store or run developer tooling
Restrict installation of untrusted applications via Mobile Device Management (MDM) policies during the remediation window

Patch Information

Apple has released fixes in macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7. Full details are available in Apple Support Advisory #149035, Apple Support Advisory #149042, and Apple Support Advisory #149043.

Workarounds

No vendor-supplied workaround exists; installing the security update is the required remediation
Enforce Gatekeeper and notarization requirements to reduce the likelihood of malicious applications executing on endpoints
Use MDM configuration profiles to limit application installation sources to the Mac App Store and identified developers until patches are deployed

bash

# Verify the installed macOS version on managed endpoints
sw_vers -productVersion

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