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Fencer Intel
critical 9.9

CVE-2026-54402 json

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

published 4mo ago modified 4mo ago also EUVD-2026-41391

cvss
9.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits
0
none known

Summary

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.

Patch / fix

  • Ubiquiti Inc UniFi OS Server 5.1.19
  • Ubiquiti Inc Dream Machines 5.1.19
  • Ubiquiti Inc Enterprise Fortress Gateway 5.1.19
  • Ubiquiti Inc Dream Wall 5.1.19
  • Ubiquiti Inc Dream Routers 5.1.19
  • Ubiquiti Inc Express 7 5.1.19
  • Ubiquiti Inc Cloud Keys 5.1.19
  • Ubiquiti Inc Network Video Recorders 5.1.19
  • Ubiquiti Inc Enterprise Video Recorders 5.1.19
  • Ubiquiti Inc Cloud Gateways 5.1.19
  • Ubiquiti Inc Network Attached Storage 5.1.19
  • Ubiquiti Inc Enterprise Firewall Core 5.1.19

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
4mo ago

Exploit prediction

1.76% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 9.9 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Ubiquiti Inc UniFi OS Server
  • Ubiquiti Inc Dream Machines
  • Ubiquiti Inc Enterprise Fortress Gateway
  • Ubiquiti Inc Dream Wall
  • Ubiquiti Inc Dream Routers
  • Ubiquiti Inc Express 7
  • Ubiquiti Inc Cloud Keys
  • Ubiquiti Inc Network Video Recorders
  • Ubiquiti Inc Enterprise Video Recorders
  • Ubiquiti Inc Cloud Gateways
  • Ubiquiti Inc Network Attached Storage
  • Ubiquiti Inc Enterprise Firewall Core

Classification

Weakness
  • CWE-20 Improper Input Validation
  • CWE-77 Improper Neutralization of Special Elements used in a Command

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.