CVE-2026-77533 in UniFi Protect
Summary
by MITRE • 08/26/2026
A malicious actor with access to the network and low privileges could exploit an Improper Input Validation vulnerability found in UniFi Protect Application to execute a Command Injection on the host device.
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Analysis
by VulDB Data Team • 08/26/2026
The discovery of a command injection vulnerability within the UniFi Protect application represents a significant security risk for organizations relying on this platform for video surveillance and physical security management. This specific flaw stems from improper input validation, where the software fails to adequately sanitize or verify user-supplied data before processing it through system-level commands. In typical operational scenarios, applications must treat all external inputs as untrusted until they have been rigorously checked against expected formats and constraints. When this principle is violated, an attacker can inject malicious shell commands that are subsequently executed by the application with the privileges of the underlying service or host operating system. This type of vulnerability is particularly dangerous because it bypasses higher-level security controls such as authentication mechanisms if the attacker already possesses valid credentials or network access to interact with the vulnerable component.
From a technical perspective, command injection occurs when an application constructs OS commands using unsanitized input from users. In the context of UniFi Protect, this likely involves endpoints that accept parameters for device configuration, camera settings, or system management tasks. If these inputs are directly concatenated into shell strings without proper escaping or validation against a whitelist of allowed characters and values, an attacker can terminate the intended command and append arbitrary commands. For instance, if the application accepts a hostname or IP address input to test connectivity, an attacker might inject syntax such as semicolons or ampersands followed by malicious scripts. This allows for remote code execution on the host device running the UniFi Protect software, potentially leading to full system compromise depending on the privilege level of the service account executing these commands.
The operational impact of this vulnerability is severe and multifaceted. An attacker with low privileges who has gained access to the network can leverage this flaw to escalate their position within the environment. By achieving command injection, they may exfiltrate sensitive video footage, manipulate recording schedules, or disable security alerts, thereby undermining the core purpose of the surveillance system. Furthermore, the compromised host device could serve as a pivot point for lateral movement across the corporate network. Attackers might install backdoors, deploy ransomware, or harvest credentials stored on the server, leading to broader data breaches and operational disruptions. The ability to execute arbitrary commands means that the integrity, availability, and confidentiality of the entire security infrastructure are at risk, potentially resulting in significant financial loss and reputational damage for affected organizations.
This vulnerability aligns 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 relates to CWE-20, Improper Input Validation, highlighting the root cause of the flaw where input filtering mechanisms are insufficient or incorrectly implemented. In terms of threat modeling and attack patterns, this scenario corresponds to MITRE ATT&CK technique T1059, specifically sub-techniques involving command and script interpreters such as Command Line Interface (T1059.004). The exploitation path typically involves Initial Access through network connectivity followed by Execution via injected commands, illustrating a critical failure in defense-in-depth strategies where input validation serves as the primary control against code injection attacks.
To mitigate this risk, immediate action is required to patch the UniFi Protect application to the latest version released by Ubiquiti Inc., which includes fixes for improper input validation issues. Administrators should verify that all components of their surveillance infrastructure are updated and configured according to security best practices. Network segmentation strategies should be reviewed to ensure that devices running critical services like video management systems are isolated from general user networks, limiting the attack surface available to low-privileged actors. Additionally, implementing strict firewall rules can restrict inbound traffic to only necessary ports and sources, reducing the likelihood of unauthorized access attempts. Regular security audits and penetration testing focused on input validation weaknesses will help identify similar vulnerabilities in other applications within the environment before they can be exploited by malicious actors.