A newly revealed privilege escalation technique in macOS has raised significant concerns regarding the security of enterprise systems. This vulnerability, which allows for the covert disabling of essential security tools from an ordinary user account, impacts several widely-used endpoint detection and response (EDR) as well as mobile device management (MDM) products.
Research conducted by XM Cyber, a company specializing in exposure management, detailed a method by which a non-root user can exploit macOS’s trusted software verification. The vulnerability enables unauthorized calls to privileged functions without requiring any form of authentication.
At the core of this issue is XPC, the inter-process communication service that macOS applications utilize to interact with background processes. XM Cyber highlights that this flaw impacts a plethora of applications, potentially undermining security measures that organizations depend on to protect their systems.
### Turning Security Tools Against Themselves
Many applications running on macOS operate with a privileged helper in root mode, allowing their signed components to communicate through XPC. This helper system relies on a trust model based on the code signature, known as the CDHash, to determine which applications can communicate securely.
Investigators at XM Cyber discovered that macOS retains this trust in a cached manner once an application has initially executed. An attacker could take advantage of this by initiating a legitimate app and then modifying it to load a malicious interface file. This manipulation allows the malicious code to inherit the trusted status of the legitimate application. Consequently, the attacker gains the ability to invoke the helper’s most sensitive functions without any authentication hurdles.
These sensitive functions can include methods designed to execute commands or terminate applications and system extensions. Exploiting these functions, an attacker could compel a security product to deactivate or uninstall itself, circumventing its own internal tamper protection mechanisms. Disturbingly, this exploit uses regular macOS behavior to operate, which results in almost no forensic evidence being left behind.
### CrowdStrike Responds to the Findings
XM Cyber successfully validated this technique against well-known EDR tools, specifically with CrowdStrike’s Falcon sensor. They were able to fully disable the agent from a standard user account, thereby eliminating its detection, process monitoring, and network visibility capabilities. In response to these alarming findings, CrowdStrike implemented detection and prevention measures across all supported versions of its macOS sensor. They also took action against Kandji’s MDM agent, which has since been patched and assigned CVE-2026-39118 for tracking.
A spokesperson from CrowdStrike noted, “The technique exploits a macOS issue, and we have detections and preventions in place for the Falcon sensor.” This immediate acknowledgment demonstrates the importance of agile responses in the cybersecurity landscape.
In their research, XM Cyber’s Hillel Pinto developed an open-source tool named XPC Hunter, which scans installed macOS applications for the same vulnerability. Pinto plans to present this tool at Black Hat US in August, emphasizing the negative impact of such vulnerabilities on enterprise security.
Although the attack requires an existing foothold—a standard local account—XM Cyber framed their observations primarily as an insider or post-compromise risk. This underscores the threat posed not only by external attackers but also by potential malicious actions from within an organization.
The fix for this vulnerability appears to be relatively straightforward. XM Cyber advocates for developers to validate the caller’s identity during the XPC handshake process. They recommend utilizing validation checks that Apple has made available since macOS 13, instead of relying on the potentially compromised cached signatures.
Pinto asserts that organizations should consider this technique a serious vulnerability within modern endpoint security frameworks. While the major vendors have implemented patches, significant concerns remain regarding the multitude of other macOS applications that have yet to address this critical oversight.
In conclusion, this vulnerability presents a stark reminder of the complexities facing modern cybersecurity frameworks, particularly in enterprise environments. As organizations navigate this evolving threat landscape, the focus must remain on not only fortifying existing defenses but also ensuring that software developers adhere to best security practices. The swift reaction from major cybersecurity firms illustrates the collective effort to mitigate risks and enhance the integrity of endpoint security systems.