CVE-2026-34909

Analyzed Analyzed - Analysis Complete

Path Traversal in UniFi OS Devices

Publication date: 2026-05-22

Last updated on: 2026-06-24

Assigner: HackerOne

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 Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-05-22

Last Modified

2026-06-24

Generated

2026-07-02

AI Q&A

2026-05-22

EPSS Evaluated

2026-06-30

NVD

CVE-2026-34909

EUVD

EUVD-2026-31384

Affected Vendors & Products

Vendor	Product	Version / Range
ui	unifi_os_server	to 5.0.8 (exc)
ui	unifi_cloud_gateway_industrial_firmware	to 5.1.12 (exc)
ui	unifi_dream_machine_firmware	to 5.1.12 (exc)
ui	unifi_dream_machine_pro_firmware	to 5.1.12 (exc)
ui	unifi_dream_machine_special_edition_firmware	to 5.1.12 (exc)
ui	unifi_dream_machine_pro_max_firmware	to 5.1.12 (exc)
ui	enterprise_fortress_gateway_firmware	to 5.1.12 (exc)
ui	unifi_dream_wall_firmware	to 5.1.12 (exc)
ui	unifi_dream_router_firmware	to 5.1.12 (exc)
ui	unifi_dream_router_7_firmware	to 5.1.12 (exc)
ui	unifi_express_7_firmware	to 5.1.12 (exc)
ui	unifi_network_video_recorder_firmware	to 5.1.12 (exc)
ui	unifi_network_video_recorder_pro_firmware	to 5.1.12 (exc)
ui	unifi_network_video_recorder_instant_firmware	to 5.1.12 (exc)
ui	enterprise_network_video_recorder_firmware	to 5.1.12 (exc)
ui	unifi_cloud_gateway_ultra_firmware	to 5.1.12 (exc)
ui	unifi_cloud_gateway_max_firmware	to 5.1.12 (exc)
ui	unifi_cloud_gateway_fiber_firmware	to 5.1.12 (exc)
ui	unifi_dream_router_5g_max_firmware	to 5.1.12 (exc)
ui	enterprise_network_video_recorder_core_firmware	to 5.1.12 (exc)
ui	unifi_cloud_key_plus_firmware	to 5.1.12 (exc)
ui	unifi_cloudkey_firmware	to 5.1.12 (exc)
ui	unifi_cloudkey_enterprise_firmware	to 5.1.12 (exc)
ui	unifi_network_video_recorder_g2_firmware	to 5.1.12 (exc)
ui	unifi_network_video_recorder_g2_pro_firmware	to 5.1.12 (exc)
ui	unifi_dream_machine_beast_firmware	to 5.1.11 (exc)
ui	unas_2_firmware	to 5.1.10 (exc)
ui	unas_4_firmware	to 5.1.10 (exc)
ui	unas_pro_firmware	to 5.1.10 (exc)
ui	unas_pro_4_firmware	to 5.1.10 (exc)
ui	unas_pro_8_firmware	to 5.1.10 (exc)
ui	unifi_express_firmware	to 4.0.14 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-22	The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Attack-Flow Graph

Executive Summary

This vulnerability is a Path Traversal flaw found in UniFi OS devices. It allows a malicious actor who has network access to exploit the system by navigating the file system in an unauthorized way. This can lead to accessing files on the underlying system that should normally be protected.

By exploiting this vulnerability, the attacker could manipulate these files to gain access to an underlying account on the device.

Impact Analysis

This vulnerability can have a severe impact because it allows an attacker to gain unauthorized access to sensitive files and accounts on UniFi OS devices.

The CVSS score of 10.0 indicates it is critical, meaning it can lead to complete compromise of confidentiality, integrity, and availability of the affected system.

Unauthorized access to sensitive system files.
Potential takeover of user accounts on the device.
Full system compromise including data theft, manipulation, or denial of service.

Hi! I’m here to help you understand CVE-2026-34909. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70