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Fencer Intel
high 8.6

CVE-2026-54403 json

A malicious actor with access to the network could exploit a Path Traversal vulnerability found in certain devices running UniFi OS to bypa…

published 4mo ago modified 4mo ago also EUVD-2026-41381

cvss
8.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits
0
none known

Summary

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.

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
yes
Technical impact
partial
Assessed
4mo ago

Exploit prediction

0.77% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

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-22 Improper Limitation of a Pathname to a Restricted Directory

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.