by Kastro
Paper/Archive/CVE-2026-54402

CVE-2026-54402

Ubiquiti Inc UniFi OS Server — A malicious actor with access to the network and low privileges could exploit an Improper Input Validation vulnerability found in UniFi O…

EPSS 2%CVSS 9.9
critical.is priorityof 100
45
CVSS 9.9 (CNA)9.9 / 10 × 3029.7Not in CISA KEV+300.0EPSS percentile 78.0.780 × 2015.6No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

A malicious actor with access to the network and low privileges could exploit an Improper Input Validation vulnerability found in UniFi OS to execute a Command Injection on the host device.

Affected

ProductAffectedFixed inSource
UniFi OS Server< 5.1.195.1.19CNA
Dream Machines< 5.1.195.1.19CNA
Enterprise Fortress Gateway< 5.1.195.1.19CNA
Dream Wall< 5.1.195.1.19CNA
Dream Routers< 5.1.195.1.19CNA
Express 7< 5.1.195.1.19CNA
Cloud Keys< 5.1.195.1.19CNA
Network Video Recorders< 5.1.195.1.19CNA
Enterprise Video Recorders< 5.1.195.1.19CNA
Cloud Gateways< 5.1.195.1.19CNA
Network Attached Storage< 5.1.195.1.19CNA
Enterprise Firewall Core< 5.1.195.1.19CNA

Scores by source

hackerone (CNA)9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refcommunity.ui.com/releases/Security-Advisory-Bulletin-066-066/984eceb3-49c8-4227-942d-671c289b3afc