Review reviewHigh

CVE-2026-54402

Ubiquiti Inc UniFi OS Server, Dream Machines, Enterprise Fortress Gateway

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.

CVSS
8.8
EPSS
1.18%
64.6% percentile
CISA KEV
Not listed
Published
2026.07.03
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability1.18%
Technical severityCVSS 8.8

Vulnerability overview

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 product and versions

Product
Ubiquiti Inc UniFi OS Server, Dream Machines, Enterprise Fortress Gateway
Affected versions
<= 5.1.15, <= 5.1.16, <= 5.1.18
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Ubiquiti Inc UniFi OS Server, Dream Machines, Enterprise Fortress Gateway and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-20, CWE-77