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CVE-2026-54402

UI Unifi OS Server command injection

9.9 CRITICALEPSS 1.76%
  1. Published2 Jul 2026

Description

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

UI Unifi OS Server≤ 5.1.15
UI Enterprise Firewall Core Firmware≤ 5.1.18
UI Enterprise Fortress Gateway Firmware≤ 5.1.15
UI Enterprise Network Video Recorder Core Firmware≤ 5.1.15
UI Enterprise Network Video Recorder Firmware≤ 5.1.15
UI Unas 2 Firmware≤ 5.1.16
UI Unas 4 Firmware≤ 5.1.16
UI Unas Pro 4 Firmware≤ 5.1.16
UI Unas Pro 8 Firmware≤ 5.1.16
UI Unas Pro Firmware≤ 5.1.16
UI Unifi Cloud Gateway Fiber Firmware≤ 5.1.15
UI Unifi Cloud Gateway Industrial Firmware≤ 5.1.15
UI Unifi Cloud Gateway Max Firmware≤ 5.1.15
UI Unifi Cloud Gateway Ultra Firmware≤ 5.1.15
UI Unifi Cloudkey Enterprise Firmware≤ 5.1.15
UI Unifi Cloudkey Firmware≤ 5.1.15
UI Unifi Cloud Key Plus Firmware≤ 5.1.15
UI Unifi Dream Machine Beast Firmware≤ 5.1.15
UI Unifi Dream Machine Firmware≤ 5.1.15
UI Unifi Dream Machine Pro Firmware≤ 5.1.15
UI Unifi Dream Machine Pro Max Firmware≤ 5.1.15
UI Unifi Dream Machine Special Edition Firmware≤ 5.1.15
UI Unifi Dream Router 5g Max Firmware≤ 5.1.15
UI Unifi Dream Router 7 Firmware≤ 5.1.15

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2026-54402 being actively exploited?

CVE-2026-54402 is not in the CISA KEV catalog. Its EPSS exploit probability is 1.76%.

How severe is CVE-2026-54402?

CVE-2026-54402 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 1.76% probability of exploitation.

Which products are affected by CVE-2026-54402?

Affected products include UI Unifi OS Server, UI Enterprise Firewall Core Firmware, UI Enterprise Fortress Gateway Firmware, UI Enterprise Network Video Recorder Core Firmware, UI Enterprise Network Video Recorder Firmware, and 19 more.

How do I fix CVE-2026-54402?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-54402 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.