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 risk81th percentile - higher than 81% of all known CVEs
Summary
Path Traversal vulnerability in UniFi OS devices. An attacker with network access can read system files and potentially gain access to a user account.
Risk Assessment
An attacker can steal sensitive data such as passwords or keys and gain unauthorized access to the system.
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 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.