CVE-2026-11318 in DeskIn
Summary
by MITRE • 10/09/2026
Deskin through 3.3.4.3 contains a privilege escalation vulnerability in the com.deskin.service.installer XPC service that allows local unprivileged attackers to execute arbitrary installer packages as root by connecting to the root-owned service without authentication. Attackers can invoke the privileged installer method to run an attacker-supplied installer, achieving full root compromise of the macOS host.
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Analysis
by VulDB Data Team • 10/09/2026
The vulnerability identified in Deskin through version 3.3.4.3 represents a critical privilege escalation flaw within the com.deskin.service.installer XPC service on macOS systems. This issue stems from an improper implementation of access controls for inter-process communication, specifically allowing local unprivileged users to interact with a root-owned service without requiring any form of authentication or authorization checks. In modern macOS environments, XPC services are commonly used to facilitate secure and efficient communication between different processes, often bridging the gap between user-space applications and system-level daemons that require elevated privileges. However, in this specific instance, the security boundary protecting the installer functionality was effectively bypassed due to a lack of strict validation on incoming connections from non-privileged entities.
From a technical perspective, the core flaw lies in the service's failure to verify the identity or privilege level of the client initiating the connection. By design, XPC services that perform sensitive operations such as software installation should enforce rigorous authentication mechanisms, typically leveraging macOS security frameworks like Authorization Services or checking for specific entitlements and user identifiers. The absence of these checks means that any local process running under a standard user account can establish a direct channel to the privileged installer service. Once connected, the attacker gains the ability to invoke methods intended exclusively for administrative users, effectively elevating their privileges from an unprivileged state to root level without providing valid credentials or triggering system prompts for approval.
The operational impact of this vulnerability is severe, as it enables local attackers to achieve full root compromise of the affected macOS host. With root access, an attacker can install arbitrary software packages that are signed and validated by the system installer but authored by the adversary. This capability allows for the silent deployment of malicious payloads, backdoors, or persistent malware that operates with the highest level of system privileges. Such actions can lead to complete data exfiltration, modification of critical system files, installation of keyloggers or remote access trojans, and further lateral movement within a network if the compromised host is connected to one. The ability to execute arbitrary installer packages also means that attackers can bypass certain application sandboxing restrictions by leveraging the trusted status of the macOS Installer process itself.
This vulnerability aligns with CWE-269, which classifies Improper Privilege Management, specifically where an actor obtains privileges it should not have due to a failure in access control logic. Furthermore, from the perspective of the MITRE ATT&CK framework, this exploit maps directly to T1055.004, Process Injection: Dynamic Linker Hijacking or more accurately T1610, Deploying Payload via Installer Packages, and falls under the broader tactic of Privilege Escalation (T1068). The attack vector is classified as Local (T1059), requiring physical or logical access to the user account on the target machine.
Mitigation for this vulnerability requires immediate action by both users and developers. Users should update Deskin to version 3.3.4.4 or later, where the vendor has presumably implemented proper authentication checks within the com.deskin.service.installer XPC service. Until an official patch is applied, administrators can mitigate risk by restricting local user access through strict file permissions on the application bundle and its associated services, although this may impact functionality. Additionally, enabling macOS Gatekeeper and ensuring that system integrity protection (SIP) remains active can help detect or prevent some of the downstream effects of such privilege escalation attempts. Developers must ensure that all XPC services adhere to the principle of least privilege, implementing robust authorization checks before allowing any interaction with privileged APIs.