CVE-2026-34909: Ubiquiti UniFi OS Path Traversal Vulnerability

Required action (CISA's text)

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.

Description (NVD)

Ubiquiti UniFi OS contains a path traversal vulnerability which could allow a malicious actor with access to the network to access files on the underlying system that could be manipulated to access an underlying account.

SOURCES

• CISA KEVCISA Known Exploited Vulnerabilities catalog

Other Ubiquiti flaws

• CVE-2026-34910: Ubiquiti UniFi OS Improper Input Validation Vulnerability
• CVE-2026-34908: Ubiquiti UniFi OS Improper Access Control Vulnerability
• CVE-2010-5330: Ubiquiti AirOS Command Injection Vulnerability

Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.