June 23, 2026 · Applied Cybernetics Group
CVE-2026-34909 — Ubiquiti UniFi OS
Ubiquiti UniFi OS Path Traversal Vulnerability
- Added to KEV
2026-06-23- Federal due date
2026-06-26- Vendor
- Ubiquiti
- Product
- UniFi OS
- EPSS
- 81.0th percentile (score 0.023, as of
2026-07-13) - NVD CVSS v3.1
- 10 (CRITICAL)
- Ransomware use
- Unknown
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2026-34909
CISA short description
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.
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.
NVD description
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.