CVE-2026-34909
Ubiquiti UniFi OS contains a path traversal vulnerability which could allow a malicious actor with access to the network to access files on the underlying system that could be manipulated to access an underlying account.
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A critical path traversal vulnerability in UniFi OS (Ubiquiti) devices allows an attacker on the network to access and manipulate system files, potentially leading to full account takeover. Given the common use of UniFi hardware in small-to-medium office environments and developer homelabs, this requires immediate patching.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HCWE-22CISA KEV
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
EPSS
Affects
ui:unifi_os_serverui:unifi_cloud_gateway_industrial_firmwareui:unifi_cloud_gateway_industrialui:unifi_dream_machine_firmwareui:unifi_dream_machineui:unifi_dream_machine_pro_firmwareui:unifi_dream_machine_proui:unifi_dream_machine_special_edition_firmwareui:unifi_dream_machine_special_editionui:unifi_dream_machine_pro_max_firmwareui:unifi_dream_machine_pro_maxui:enterprise_fortress_gateway_firmwareui:enterprise_fortress_gatewayui:unifi_dream_wall_firmwareui:unifi_dream_wallui:unifi_dream_router_firmwareui:unifi_dream_routerui:unifi_dream_router_7_firmwareui:unifi_dream_router_7ui:unifi_express_7_firmwareui:unifi_express_7ui:unifi_network_video_recorder_firmwareui:unifi_network_video_recorderui:unifi_network_video_recorder_pro_firmwareui:unifi_network_video_recorder_proui:unifi_network_video_recorder_instant_firmwareui:unifi_network_video_recorder_instantui:enterprise_network_video_recorder_firmwareui:enterprise_network_video_recorderui:unifi_cloud_gateway_ultra_firmwareui:unifi_cloud_gateway_ultraui:unifi_cloud_gateway_max_firmwareui:unifi_cloud_gateway_maxui:unifi_cloud_gateway_fiber_firmwareui:unifi_cloud_gateway_fiberui:unifi_dream_router_5g_max_firmwareui:unifi_dream_router_5g_maxui:enterprise_network_video_recorder_core_firmwareui:enterprise_network_video_recorder_coreui:unifi_cloud_key_plus_firmwareui:unifi_cloud_key_plusui:unifi_cloudkey_firmwareui:unifi_cloudkeyui:unifi_cloudkey_enterprise_firmwareui:unifi_cloudkey_enterpriseui:unifi_network_video_recorder_g2_firmwareui:unifi_network_video_recorder_g2ui:unifi_network_video_recorder_g2_pro_firmwareui:unifi_network_video_recorder_g2_proui:unifi_dream_machine_beast_firmwareui:unifi_dream_machine_beastui:unas_2_firmwareui:unas_2ui:unas_4_firmwareui:unas_4ui:unas_pro_firmwareui:unas_proui:unas_pro_4_firmwareui:unas_pro_4ui:unas_pro_8_firmwareui:unas_pro_8ui:unifi_express_firmwareui:unifi_expressTechnical 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.