Description

A malicious actor with access to the network and low privileges could exploit an Improper Access Control vulnerability found in UniFi Access Application to escalate privileges on the host device.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.9",
  "pubDate": "2026-08-26T11:16:39.283Z",
  "pubdate": "2026-08-26T11:16:39.283Z",
  "executiveSummary": "The UniFi Access Application is susceptible to an Improper Access Control vulnerability that enables privilege escalation on the underlying host device.\nThis security flaw stems from insufficient enforcement of authorization checks within the application's access control mechanisms.\nA malicious actor with existing low-privileged access to the network can exploit this vulnerability to bypass intended security boundaries.\nBy leveraging this flaw, an attacker can elevate their privileges to compromise the host device, potentially gaining unauthorized administrative control.\nThe vulnerability poses a significant risk to the confidentiality, integrity, and availability of the host system.\nSuccessful exploitation requires the attacker to have initial network access and low-privileged credentials for the affected UniFi Access Application environment.",
  "technicalDetails": "The vulnerability is rooted in an improper implementation of access control checks within the UniFi Access Application framework. The application fails to adequately validate the authorization level of a user when performing specific operations that interact with the host operating system or system-level configuration files.\nIn a typical attack scenario, an authenticated user with low privileges exploits the vulnerable interface by crafting specialized requests that the application processes without verifying that the requester possesses the necessary permissions for the targeted action. By manipulating parameters or calling internal functions that lack proper authorization gating, the attacker can force the application to execute commands or modify system settings with higher privileges than those currently assigned to their session.\nThe vulnerability resides within the application component responsible for handling system-level administrative tasks. When the application interacts with the underlying host, it fails to verify if the initiated process conforms to the principle of least privilege. Consequently, if the application process itself runs with elevated privileges, an attacker can indirectly perform actions that would normally require administrative or root-level access.\nThe attack flow involves the following steps: First, the attacker establishes network connectivity and authenticates as a low-privileged user within the UniFi Access Application. Second, the attacker identifies the specific application interface or endpoint that lacks proper access control validation. Third, the attacker crafts a malicious payload designed to exploit the authorization gap, essentially tricking the application into performing an unauthorized administrative action on the host device. Finally, upon successful execution, the application executes the command or modifies the target configuration, effectively escalating the attacker's privileges and granting them control over the host device beyond their originally assigned scope.\nThe impact of this vulnerability is severe, as it facilitates unauthorized host-level modifications. This could lead to persistence, complete system compromise, unauthorized data exfiltration, or further lateral movement within the network. Because the vulnerability is inherent to the application's internal access control logic, patching requires a modification of the code responsible for authorization enforcement to ensure that all system-sensitive operations are strictly validated against the user's privilege level."
}