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.
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.