Actively exploited in the wild
Ubiquiti UniFi OS Path Traversal 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-2026-34909
CriticalCVSS 10.0KEVExploitation Probability (EPSS)
High risk76th percentile — higher than 76% of all known CVEs
Summary
A Path Traversal vulnerability in UniFi OS devices can be exploited by a malicious actor with network access. This allows access to files on the underlying system, which could be manipulated to access an underlying account.
Risk Assessment
The organization is at risk of unauthorized access to sensitive data and user accounts, potentially leading to serious security breaches.
Recommendation
It is recommended to update UniFi OS devices to the latest version and implement appropriate security measures to restrict network access.
Original NVD description (English source)
A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi OS devices to access files on the underlying system that could be manipulated to access an underlying account.