Actively exploited in the wild
Ubiquiti UniFi OS Improper Input Validation Vulnerability
Ubiquiti - UniFi OS · Listed in the CISA KEV since 2026-06-23. This indicates confirmed attacks in production environments.
Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CVE-2026-34910
CriticalCVSS 10.0KEVExploitation Probability (EPSS)
Very high risk100th percentile - higher than 100% of all known CVEs
Summary
Command Injection vulnerability in UniFi OS devices. Improper input validation allows an attacker with network access to execute arbitrary system commands.
Risk Assessment
An attacker can take control of the device, execute malicious commands, and potentially spread the attack to other systems on the network.
Recommendation
Apply firmware updates provided by the vendor. Restrict network access to trusted hosts only.
Other vulnerabilities in UniFi OS
See all- CVE-2026-77550Critical
An attacker with network access could exploit an Improper Neutralization of CRLF Sequences vulnerability in certain devices running UniFi OS to bypass authentication to such UniFi OS devices or instances.
- CVE-2026-77549Critical
An attacker with network access and under certain conditions could exploit an Improper Neutralization of CRLF Sequences vulnerability in certain devices running UniFi OS to bypass authentication to such UniFi OS devices or instances.
- CVE-2026-77545Critical
An attacker with network access, low privileges, and under certain conditions can exploit an active debug code vulnerability in devices running UniFi OS to escalate privileges within those devices or instances.
- CVE-2026-77536Critical
An attacker with network access and low privileges could exploit an Improper Access Control vulnerability in devices running UniFi OS to escalate privileges within such devices or instances.
- CVE-2026-77534Critical
An attacker with network access and low privileges could exploit an Improper Access Control vulnerability in devices running UniFi OS to escalate privileges within such devices or instances.
- CVE-2026-55116Critical
A vulnerability in UniFi OS allows unauthorized changes to devices by an attacker with network access under certain network configurations.
- CVE-2026-54402Critical
A vulnerability in UniFi OS allows an attacker with network access and low privileges to execute command injection on the host device due to improper input validation.
- CVE-2026-47370Critical
Certain devices running UniFi OS are vulnerable to improper input validation, allowing a malicious actor with low privileges to execute a Command Injection attack.
- CVE-2026-47369Critical
A vulnerability related to improper input validation exists in devices running UniFi OS, which could be exploited by a malicious actor with low privileges to escalate privileges.
- CVE-2026-34909CriticalActively exploited
Path Traversal vulnerability in UniFi OS devices. An attacker with network access can read system files and potentially gain access to a user account.
Original NVD description (English source)
A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute a Command Injection.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS