Path traversal in Ubiquiti Networks products - CVE-2026-34909

Vulnerability identifier: #VU135471

CSH Severity: High

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber

CVE-ID: CVE-2026-34909

CWE-ID: CWE-22

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vendor: Ubiquiti Networks

Affected software:
UCG-Industrial
UDM
UDM-Pro
UDM-SE
UDM-Pro-Max
EFG
UDW
UDR
UDR7
Express 7
UNVR
UNVR-Pro
UNVR-Instant
ENVR
UCG-Ultra
UCG-Max
UCG-Fiber
UDR-5G
ENVR-Core
UCKP
UCK
UCK-Enterprise
UniFi OS Server
UNVR-G2
UNVR-G2-Pro
UDM-Beast
UNAS-2
UNAS-4
UNAS-Pro
UNAS-Pro-4
UNAS-Pro-8
Express

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences. A remote attacker can send a specially crafted HTTP request and access files on the underlying system that could be manipulated to access an underlying account.

Install updates from vendor's website.

• https://community.ui.com/releases/Security-Advisory-Bulletin-064-064/84811c09-4cf4-42ab-bd61-cc994445963b
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34909