CVE-2026-77548 in UniFi Protect Application
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 identified security flaw resides within the UniFi Protect application, specifically manifesting as an improper input validation mechanism that allows for command injection attacks. This vulnerability is particularly concerning because it can be exploited by an attacker who possesses only low-level network access and standard user privileges on the affected system. The core technical issue stems from the application's failure to adequately sanitize or validate specific inputs before they are processed by underlying operating system commands. When a malicious actor provides crafted input that contains special characters, shell metacharacters, or specially formatted command sequences, the application inadvertently passes these strings directly to the host device's command interpreter without proper escaping or filtering. This lack of rigorous validation creates a direct pathway for arbitrary code execution on the target infrastructure.
From an operational perspective, this vulnerability significantly lowers the barrier for entry for attackers within the network perimeter. Unlike vulnerabilities that require high-level administrative credentials or remote unauthenticated access, this flaw can be leveraged by any user with basic login capabilities to UniFi Protect services. Once exploited, the command injection allows the attacker to execute arbitrary system commands on the host device running the application. This capability effectively bypasses standard privilege boundaries, granting the attacker a level of control that far exceeds their assigned role. The impact is severe as it can lead to full compromise of the affected server or appliance, enabling further lateral movement within the network, data exfiltration, installation of persistent backdoors, or disruption of critical surveillance and security monitoring services provided by the UniFi Protect platform.
This vulnerability aligns with Common Weakness Enumeration (CWE) category CWE-78 Improper Neutralization of Special Elements used in an OS Command, commonly known as OS Command Injection. The exploitation technique is consistent with MITRE ATT&CK tactic T1059 Command and Scripting Interpreter, specifically sub-techniques involving shell commands or operating system APIs. Attackers typically utilize this flaw to gain initial foothold on a compromised host, which can then be used as a pivot point for deeper network infiltration. The severity is amplified by the fact that UniFi Protect systems often manage critical physical security infrastructure, meaning successful exploitation could have tangible real-world consequences beyond digital data loss, including potential breaches of privacy and safety monitoring capabilities.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. Administrators should immediately apply any available patches or updates released by Ubiquiti that address this specific input validation flaw. In the interim, if patching is not feasible, network segmentation should be enforced to restrict access to UniFi Protect services only from trusted management networks rather than general user subnets. Additionally, implementing strict firewall rules and intrusion detection system signatures can help identify attempts to inject shell metacharacters into application inputs. Long-term solutions involve adopting secure coding practices that emphasize parameterized commands or safe API calls instead of string concatenation for building OS command strings, ensuring that all external inputs are rigorously validated against a whitelist of expected values before processing.