CVE-2026-34909

CRITICAL KEV

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

Title source: rule
STIX 2.1

Exploitation Summary

CVE-2026-34909 is actively exploited and listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added June 23, 2026.

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 (3)

Core 3

Scores

CVSS v3 10.0
EPSS 0.0227
EPSS Percentile 81.1%
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 active
Automatable yes
Technical Impact total

Details

CISA KEV 2026-06-23
VulnCheck KEV 2026-06-09
ENISA EUVD EUVD-2026-31384
CWE
CWE-22
Status published
Products (50)
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 40 more
Published May 22, 2026
KEV Added Jun 23, 2026
Tracked Since May 22, 2026