CVE-2026-54403

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.

Published: 2026-07-02 Last update: 2026-07-09 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-54403 is rated Moderate Risk (47.7/100): CVSS High severity, with low exploitation likelihood (EPSS 0.48%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-54403

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-07-03 — 0.48% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-54403

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.6 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 4.0 [email protected]

Weakness enumeration for CVE-2026-54403

GitHub Security Advisory for CVE-2026-54403

GHSA-x73q-38h3-xg4c · Severity: high — A malicious actor with access to the network could exploit a Path Traversal vulnerability found...

Affected software / configurations for CVE-2026-54403

Vendor Product Version Raw CPE
ui unifi_os_server <= 5.1.15 cpe:2.3:a:ui:unifi_os_server:*:*:*:*:*:*:*:*
ui unifi_dream_machine_firmware <= 5.1.15 cpe:2.3:o:ui:unifi_dream_machine_firmware:*:*:*:*:*:*:*:*
ui unifi_dream_machine_pro_firmware <= 5.1.15 cpe:2.3:o:ui:unifi_dream_machine_pro_firmware:*:*:*:*:*:*:*:*
ui unifi_dream_machine_special_edition_firmware <= 5.1.15 cpe:2.3:o:ui:unifi_dream_machine_special_edition_firmware:*:*:*:*:*:*:*:*
ui unifi_dream_machine_pro_max_firmware <= 5.1.15 cpe:2.3:o:ui:unifi_dream_machine_pro_max_firmware:*:*:*:*:*:*:*:*
ui unifi_dream_machine_beast_firmware <= 5.1.15 cpe:2.3:o:ui:unifi_dream_machine_beast_firmware:*:*:*:*:*:*:*:*
ui enterprise_fortress_gateway_firmware <= 5.1.15 cpe:2.3:o:ui:enterprise_fortress_gateway_firmware:*:*:*:*:*:*:*:*
ui unifi_dream_router_firmware <= 5.1.15 cpe:2.3:o:ui:unifi_dream_router_firmware:*:*:*:*:*:*:*:*
ui unifi_dream_wall_firmware <= 5.1.15 cpe:2.3:o:ui:unifi_dream_wall_firmware:*:*:*:*:*:*:*:*
ui unifi_dream_router_7_firmware <= 5.1.15 cpe:2.3:o:ui:unifi_dream_router_7_firmware:*:*:*:*:*:*:*:*
ui unifi_express_7_firmware <= 5.1.15 cpe:2.3:o:ui:unifi_express_7_firmware:*:*:*:*:*:*:*:*
ui unifi_cloudkey_firmware <= 5.1.15 cpe:2.3:o:ui:unifi_cloudkey_firmware:*:*:*:*:*:*:*:*
ui unifi_cloud_key_plus_firmware <= 5.1.15 cpe:2.3:o:ui:unifi_cloud_key_plus_firmware:*:*:*:*:*:*:*:*
ui unifi_cloudkey_enterprise_firmware <= 5.1.15 cpe:2.3:o:ui:unifi_cloudkey_enterprise_firmware:*:*:*:*:*:*:*:*
ui unifi_network_video_recorder_firmware <= 5.1.15 cpe:2.3:o:ui:unifi_network_video_recorder_firmware:*:*:*:*:*:*:*:*
ui unifi_network_video_recorder_pro_firmware <= 5.1.15 cpe:2.3:o:ui:unifi_network_video_recorder_pro_firmware:*:*:*:*:*:*:*:*
ui unifi_network_video_recorder_instant_firmware <= 5.1.15 cpe:2.3:o:ui:unifi_network_video_recorder_instant_firmware:*:*:*:*:*:*:*:*
ui enterprise_network_video_recorder_firmware <= 5.1.15 cpe:2.3:o:ui:enterprise_network_video_recorder_firmware:*:*:*:*:*:*:*:*
ui enterprise_network_video_recorder_core_firmware <= 5.1.15 cpe:2.3:o:ui:enterprise_network_video_recorder_core_firmware:*:*:*:*:*:*:*:*
ui unifi_network_video_recorder_g2_firmware <= 5.1.15 cpe:2.3:o:ui:unifi_network_video_recorder_g2_firmware:*:*:*:*:*:*:*:*
ui unifi_network_video_recorder_g2_pro_firmware <= 5.1.15 cpe:2.3:o:ui:unifi_network_video_recorder_g2_pro_firmware:*:*:*:*:*:*:*:*
ui unifi_cloud_gateway_ultra_firmware <= 5.1.15 cpe:2.3:o:ui:unifi_cloud_gateway_ultra_firmware:*:*:*:*:*:*:*:*
ui unifi_cloud_gateway_max_firmware <= 5.1.15 cpe:2.3:o:ui:unifi_cloud_gateway_max_firmware:*:*:*:*:*:*:*:*
ui unifi_cloud_gateway_industrial_firmware <= 5.1.15 cpe:2.3:o:ui:unifi_cloud_gateway_industrial_firmware:*:*:*:*:*:*:*:*
ui unifi_cloud_gateway_fiber_firmware <= 5.1.15 cpe:2.3:o:ui:unifi_cloud_gateway_fiber_firmware:*:*:*:*:*:*:*:*
ui unas_2_firmware <= 5.1.16 cpe:2.3:o:ui:unas_2_firmware:*:*:*:*:*:*:*:*
ui unas_4_firmware <= 5.1.16 cpe:2.3:o:ui:unas_4_firmware:*:*:*:*:*:*:*:*
ui unas_pro_firmware <= 5.1.16 cpe:2.3:o:ui:unas_pro_firmware:*:*:*:*:*:*:*:*
ui unas_pro_4_firmware <= 5.1.16 cpe:2.3:o:ui:unas_pro_4_firmware:*:*:*:*:*:*:*:*
ui unas_pro_8_firmware <= 5.1.16 cpe:2.3:o:ui:unas_pro_8_firmware:*:*:*:*:*:*:*:*
ui enterprise_firewall_core_firmware <= 5.1.18 cpe:2.3:o:ui:enterprise_firewall_core_firmware:*:*:*:*:*:*:*:*
ui unifi_dream_router_5g_max_firmware <= 5.1.15 cpe:2.3:o:ui:unifi_dream_router_5g_max_firmware:*:*:*:*:*:*:*:*

References for CVE-2026-54403

cvelogic Threat Intelligence