CVE-2026-34909

CRITICAL

Ubiquiti INC UniFi OS Server - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Title source: rule

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.

References (1)

Core 1

Core References

https://community.ui.com/releases/Security-Advisory-Bulletin-064-064/84811c09-4cf4-42ab-bd61-cc994445963b

Scores

CVSS v3 10.0

EPSS 0.0062

EPSS Percentile 44.9%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact total

Details

CWE

CWE-22

Status published

Products (32)

Ubiquiti Inc/EFG < 5.1.12

Ubiquiti Inc/ENVR < 5.1.12

Ubiquiti Inc/ENVR-Core < 5.1.12

Ubiquiti Inc/Express < 4.0.14

Ubiquiti Inc/Express 7 < 5.1.12

Ubiquiti Inc/UCG-Fiber < 5.1.12

Ubiquiti Inc/UCG-Industrial < 5.1.12

Ubiquiti Inc/UCG-Max < 5.1.12

Ubiquiti Inc/UCG-Ultra < 5.1.12

Ubiquiti Inc/UCK < 5.1.12

... and 22 more

Published May 22, 2026

Tracked Since May 22, 2026