New macOS Security Vulnerability Allows Unprivileged Security Tool Disabling

Ender Öztürk

June 24, 2026

Security researchers at XM Cyber have identified a significant macOS security vulnerability that allows standard user accounts to disable critical corporate security tools without requiring administrative privileges. The findings, which will be formally presented at the upcoming Black Hat Arsenal event in August, highlight how attackers can bypass protection measures such as CrowdStrike Falcon and Kandji. By exploiting specific XPC (Cross-Process Communication) methods, unauthorized users can gain control over security software, effectively blinding endpoint protection systems. While the attack requires initial access to a standard user account on the target machine, it represents a major concern for enterprise environments that rely heavily on Mac security agents to maintain device integrity.

This discovery demonstrates that malicious actors can compromise corporate security infrastructures without needing root-level credentials or kernel-level exploits.

Researchers Analyze Exploitation of XPC Communication Channels

The core of the issue lies in the Apple XPC framework, which developers use to facilitate communication between various applications and background services. XM Cyber suggests that some software developers rely too heavily on code signing as a primary trust mechanism. By manipulating how these privileged XPC calls are verified, attackers can trick the system into executing commands that should normally be restricted to administrators.

{{WP_IMAGE_1}}

The attack chain begins when a user initiates a legitimately signed application. macOS caches the trust fingerprint of this software, allowing an attacker to replace specific portions of the application package with malicious payloads while maintaining the existing trust relationship. This cached status grants the attacker the ability to trigger privileged XPC methods, which are then used to terminate or disable security agents like CrowdStrike Falcon.

Vendors Must Update Security Protocols to Prevent Exploits

Because the vulnerability stems from the implementation logic of individual applications rather than a fundamental flaw in the macOS kernel, mitigation is largely the responsibility of software developers. Kandji has already addressed the vulnerability and has been assigned CVE-2026-39118 for its specific implementation flaw. However, other software vendors are still in the process of reviewing their own communication protocols to ensure they are not susceptible to similar manipulation.

Organizations should prioritize immediate updates for all security management software to mitigate the risks posed by this privilege escalation technique.

Enterprises Should Strengthen Device Management Policies

As Mac deployment becomes increasingly prevalent in corporate landscapes, the security of management agents becomes paramount. These tools serve as the final line of defense between a compromised account and sensitive company data. XM Cyber emphasizes that while this technique requires a foothold, the absence of a requirement for administrative privileges makes it a potent tool for lateral movement and persistence within a network.

Apple has not yet issued a formal security advisory regarding the broader systemic implications of this research. In the interim, security experts recommend that organizations enforce strong password policies and implement multi-factor authentication to prevent the initial account compromise necessary to launch these attacks. Keeping the operating system and all third-party security management agents updated remains the most effective defense against such evolving threats.

Given the increasing reliance on endpoint security tools in your organization, how concerned are you about potential vulnerabilities in macOS management agents? Share your thoughts and security strategies in the comments section below.