CVE-2026-34911
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Path Traversal in UniFi OS Devices

Vulnerability report for CVE-2026-34911, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-05-22

Last updated on: 2026-06-24

Assigner: HackerOne

Description

A malicious actor with access to the network and low privileges could exploit a Path Traversal vulnerability found in UniFi OS devices to access files on the underlying system that could be manipulated to obtain sensitive information.

CVSS Scores

EPSS Scores

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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
EUVD

Affected Vendors & Products

Showing 31 associated CPEs
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)

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
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

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Executive Summary

This vulnerability is a Path Traversal flaw found in UniFi OS devices. It allows a malicious actor who has network access and low privileges to exploit the system by accessing files on the underlying operating system that they should not normally be able to reach.

By exploiting this vulnerability, the attacker can potentially manipulate these files to obtain sensitive information.

Compliance Impact

This vulnerability allows a malicious actor with network access and low privileges to exploit a Path Traversal flaw in UniFi OS devices, potentially accessing sensitive information stored on the system.

Access to sensitive information through this vulnerability could lead to non-compliance with data protection regulations such as GDPR and HIPAA, which require safeguarding personal and sensitive data against unauthorized access.

Therefore, exploitation of this vulnerability may result in violations of these standards due to the exposure of protected information.

Impact Analysis

The impact of this vulnerability is that an attacker with network access and low privileges could gain unauthorized access to sensitive files on the system. This could lead to the exposure of confidential information.

Since the vulnerability has a high confidentiality impact (C:H) and a critical scope (S:C), it means that the attacker could access sensitive data without needing elevated privileges, potentially compromising the security of the affected device and any data it holds.

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EPSS Chart