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CVE-2026-34909

CRITICAL10.0
CISA KEV

Published 2026-05-22 · Updated 2026-07-23 · Source support@hackerone.com

Summary

CVE-2026-34909 is a critical-severity (CVSS 10.0) vulnerability in Ubiquiti UniFi OS. CISA added it to the Known Exploited Vulnerabilities catalog on June 23, 2026, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by June 26, 2026. CISA does not currently list it as used in ransomware campaigns. Ubiquiti has 4 vulnerabilities in the KEV catalog, 0 of them linked to ransomware.

All 4 known-exploited Ubiquiti vulnerabilities →

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.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CWE-22

CISA Known-Exploited Vulnerability

Product: Ubiquiti — UniFi OS

Name: Ubiquiti UniFi OS Path Traversal Vulnerability

Date added: 2026-06-23 · Due: 2026-06-26

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.

References

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