CVE-2026-54403
High
Description
A malicious actor with access to the network could exploit a Path Traversal vulnerability found in certain devices running UniFi OS to bypass authentication of such UniFi OS devices or instances.
SeverityHigh
CVSS8.6
Exploit probability—
ProductUi Unifi Os Server
PublishedJul 2, 2026
First seenJul 2, 2026
Weakness typeCWE-22Path traversal
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| ui unifi_os_server | v ≤ 5.1.15 | — |
| ui unifi_dream_machine_firmware | v ≤ 5.1.15 | — |
| ui unifi_dream_machine_pro_firmware | v ≤ 5.1.15 | — |
| ui unifi_dream_machine_special_edition_firmware | v ≤ 5.1.15 | — |
| ui unifi_dream_machine_pro_max_firmware | v ≤ 5.1.15 | — |
| ui unifi_dream_machine_beast_firmware | v ≤ 5.1.15 | — |
| ui enterprise_fortress_gateway_firmware | v ≤ 5.1.15 | — |
| ui unifi_dream_router_firmware | v ≤ 5.1.15 | — |
| ui unifi_dream_wall_firmware | v ≤ 5.1.15 | — |
| ui unifi_dream_router_7_firmware | v ≤ 5.1.15 | — |
| ui unifi_express_7_firmware | v ≤ 5.1.15 | — |
| ui unifi_cloudkey_firmware | v ≤ 5.1.15 | — |
| ui unifi_cloud_key_plus_firmware | v ≤ 5.1.15 | — |
| ui unifi_cloudkey_enterprise_firmware | v ≤ 5.1.15 | — |
| ui unifi_network_video_recorder_firmware | v ≤ 5.1.15 | — |
| ui unifi_network_video_recorder_pro_firmware | v ≤ 5.1.15 | — |
| ui unifi_network_video_recorder_instant_firmware | v ≤ 5.1.15 | — |
| ui enterprise_network_video_recorder_firmware | v ≤ 5.1.15 | — |
| ui enterprise_network_video_recorder_core_firmware | v ≤ 5.1.15 | — |
| ui unifi_network_video_recorder_g2_firmware | v ≤ 5.1.15 | — |
| ui unifi_network_video_recorder_g2_pro_firmware | v ≤ 5.1.15 | — |
| ui unifi_cloud_gateway_ultra_firmware | v ≤ 5.1.15 | — |
| ui unifi_cloud_gateway_max_firmware | v ≤ 5.1.15 | — |
| ui unifi_cloud_gateway_industrial_firmware | v ≤ 5.1.15 | — |
| ui unifi_cloud_gateway_fiber_firmware | v ≤ 5.1.15 | — |
| ui unas_2_firmware | v ≤ 5.1.16 | — |
| ui unas_4_firmware | v ≤ 5.1.16 | — |
| ui unas_pro_firmware | v ≤ 5.1.16 | — |
| ui unas_pro_4_firmware | v ≤ 5.1.16 | — |
| ui unas_pro_8_firmware | v ≤ 5.1.16 | — |
| ui enterprise_firewall_core_firmware | v ≤ 5.1.18 | — |
| ui unifi_dream_router_5g_max_firmware | v ≤ 5.1.15 | — |
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