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
UniFi OS devices have a vulnerability due to improper input validation that can be exploited by a malicious actor with network access to perform Command Injection.
Risk Assessment
This threat could lead to unauthorized command execution on devices, potentially resulting in serious security implications for the network.
Recommendation
It is recommended to update UniFi OS devices to the latest version to patch this vulnerability and to monitor network access.
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.