CVE-2026-77535 in UniFi Network Application
Summary
by MITRE • 08/26/2026
A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerability found in UniFi Network Application to execute a Command Injection on an adopted device.
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Analysis
by VulDB Data Team • 08/26/2026
The identified security flaw represents a critical command injection vulnerability within the UniFi Network Application, specifically affecting devices that have been adopted into the management controller's infrastructure. This type of vulnerability arises from improper input validation mechanisms where user-supplied data is not adequately sanitized or validated before being processed by backend systems. In this specific context, an attacker who has already established a foothold on the network and possesses high-level administrative privileges can manipulate inputs intended for device configuration or status queries to inject arbitrary operating system commands. The severity of this issue is compounded by the privilege level required; while it demands significant initial access, such as that gained through compromised administrator credentials or advanced persistent threats within an enterprise environment, the resulting impact allows for complete control over adopted network devices rather than just the management application itself.
From a technical perspective, command injection vulnerabilities typically occur when applications pass unsafe user input to system-level commands without proper escaping of special characters. In the UniFi ecosystem, this likely involves endpoints where configuration parameters or diagnostic inputs are constructed into shell commands using string concatenation rather than safe parameterized execution methods. When an attacker with high privileges submits crafted data containing metacharacters such as semicolons, pipes, or backticks, these symbols can terminate the intended command and initiate new ones. This allows the malicious actor to execute arbitrary code on the underlying operating system of the adopted device, which often runs a Linux-based firmware environment. The lack of strict input validation means that the application trusts administrative inputs implicitly, failing to distinguish between legitimate configuration data and executable payloads designed for exploitation.
The operational impact of this vulnerability is severe, as it effectively bypasses the security boundary between the management plane and the control or data planes of network infrastructure. An attacker leveraging this flaw can achieve remote code execution on adopted devices, which may include wireless access points, switches, gateways, or other IoT endpoints managed by UniFi software. This capability enables a wide range of malicious activities including pivoting to internal networks, exfiltrating sensitive configuration data such as Wi-Fi passwords and VPN credentials, installing persistent backdoors for long-term surveillance, or disrupting network availability through denial-of-service actions. Furthermore, because the attacker operates with high privileges within the UniFi application, they can potentially propagate this compromise across multiple devices simultaneously by targeting shared configurations or batch operations, thereby escalating a localized breach into a widespread infrastructure compromise.
This vulnerability aligns closely with Common Weakness Enumeration (CWE) ID 78, which defines Improper Neutralization of Special Elements used in an OS Command commonly known as OS Command Injection. It also maps to the MITRE ATT&CK framework under techniques such as T1059 Command and Scripting Interpreter, where adversaries use system utilities or scripting languages to execute commands on compromised hosts. The prerequisite of high privileges places this within the context of lateral movement or privilege abuse scenarios often seen in advanced threat actor campaigns targeting network infrastructure management systems.
To mitigate these risks, administrators should ensure that UniFi Network Application is updated to the latest version released by Ubiquiti Inc., which includes patches for improper input validation flaws. In environments where immediate patching is not feasible, strict access control policies must be enforced to limit who holds high-privilege accounts within the application. Implementing network segmentation can help isolate management traffic from general user data flows, reducing the attack surface available to potential intruders. Additionally, monitoring for unusual command execution patterns or unexpected outbound connections from adopted devices can aid in early detection of exploitation attempts. Regular audits of administrative access and adherence to the principle of least privilege are essential defensive measures against this class of vulnerabilities.