CVE-2025-43188: Apple macOS Privilege Escalation Flaw

CVE-2025-43188 Overview

CVE-2025-43188 is a local privilege escalation vulnerability in Apple macOS. The flaw stems from a permissions issue that Apple resolved by introducing additional restrictions in macOS Sequoia 15.6. A malicious application running on an affected system can leverage the weakness to gain root privileges, bypassing the standard macOS privilege boundary that separates user-level processes from system-level operations.

The vulnerability is classified under [CWE-269] Improper Privilege Management. Apple addressed the issue in its July 2025 security update bundle for macOS Sequoia.

Critical Impact
A malicious app executing under a standard user account can escalate to root, achieving full control over the host operating system.

Affected Products

Apple macOS versions prior to macOS Sequoia 15.6
Systems running unpatched macOS Sequoia installations
Any macOS environment where users can install or execute third-party applications

Discovery Timeline

2025-07-30 - CVE-2025-43188 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-43188

Vulnerability Analysis

CVE-2025-43188 is a local privilege escalation flaw rooted in improper privilege management within macOS. Apple's advisory describes the root cause as a permissions issue that was remediated by adding stricter access controls in macOS Sequoia 15.6.

Exploitation requires a malicious application to already be running on the target system. Once executed, the application can abuse the insufficient permission checks to perform actions reserved for the root user. This crosses the boundary between unprivileged code and privileged kernel-adjacent operations.

The flaw is local in nature, meaning network exploitation is not possible. However, malicious apps delivered through phishing, malicious downloads, or supply chain compromise can trigger the condition. Successful exploitation yields full confidentiality, integrity, and availability impact on the affected host.

Root Cause

The underlying weakness is improper privilege management [CWE-269]. A macOS component performed an action without enforcing sufficient permission restrictions on the calling process. Apple did not publish low-level technical details, but the fix specifically introduces additional restrictions to close the privilege boundary gap.

Attack Vector

An attacker must first achieve code execution on the target macOS host, typically by convincing a user to run a malicious application. The user interaction requirement aligns with common macOS social engineering paths such as trojanized installers or sideloaded apps. Once running, the malicious app invokes the vulnerable system functionality to escalate to root without legitimate authorization.

No public proof-of-concept exploit code is currently available for CVE-2025-43188. See the Apple Support Article and the Full Disclosure Mailing List Post for available technical details.

Detection Methods for CVE-2025-43188

Indicators of Compromise

Unexpected processes running with uid=0 (root) that were spawned by user-level applications
Newly created LaunchDaemons or LaunchAgents in /Library/LaunchDaemons/ or /Library/LaunchAgents/ following execution of an untrusted application
Modifications to protected system paths such as /usr/local/, /Library/, or /private/etc/ originating from non-system parent processes
Execution of unsigned or ad-hoc signed binaries shortly before privilege transitions

Detection Strategies

Monitor for parent-child process anomalies where a standard user application spawns a child process running as root
Audit Endpoint Security Framework (ESF) events for ES_EVENT_TYPE_NOTIFY_EXEC and ES_EVENT_TYPE_NOTIFY_SETUID transitions tied to non-privileged callers
Correlate Unified Log entries from com.apple.securityd and com.apple.authd showing unexpected authorization grants
Inspect installed applications and recent quarantine events for software that triggered privilege escalation behavior

Monitoring Recommendations

Enable verbose audit logging via auditd for the pm (process management) and ad (administrative) event classes
Centralize macOS endpoint telemetry into a SIEM or data lake for correlation across hosts
Baseline normal privileged process activity and alert on deviations such as sudo or setuid calls from non-administrative apps
Track software inventory changes to surface newly introduced unsigned applications across the fleet

How to Mitigate CVE-2025-43188

Immediate Actions Required

Update all affected systems to macOS Sequoia 15.6 or later without delay
Inventory macOS endpoints across the environment and identify hosts still running pre-15.6 builds
Restrict installation of third-party applications through MDM policies and Gatekeeper enforcement
Review recently installed applications on managed Macs for unauthorized or unsigned software

Patch Information

Apple released the fix for CVE-2025-43188 in macOS Sequoia 15.6. The advisory and full list of addressed CVEs are available in the Apple Support Article. Administrators should deploy the update through their standard patch management workflow, such as Apple Software Update, MDM-managed update commands, or softwareupdate from the command line.

Workarounds

No vendor-supplied workaround exists; applying macOS Sequoia 15.6 is the only supported remediation
Enforce least-privilege user accounts and remove standard users from the local admin group where feasible
Require notarized and signed applications by configuring Gatekeeper to its strictest setting
Use MDM allowlisting to prevent execution of unapproved binaries on managed endpoints

bash

# Check current macOS version and apply available updates
sw_vers -productVersion
sudo softwareupdate --install --all --restart

# Verify Gatekeeper is enabled and enforcing
spctl --status
sudo spctl --master-enable