CVE-2026-34908
Ubiquiti UniFi OS contains an improper access control vulnerability which could allow a malicious actor with access to the network to make unauthorized changes to the system.
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A critical vulnerability with a CVSS score of 10.0 has been identified in Ubiquiti UniFi OS devices. An attacker with network access can bypass access controls to make unauthorized changes to the system, potentially compromising network gateways and controllers used in many development environments.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HCWE-284CISA 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_8Technical description
A malicious actor with access to the network could exploit an Improper Access Control vulnerability found in UniFi OS devices to make unauthorized changes to the system.