Vulnerability · Published Jul 2, 2026 · Assigned by hackerone
CVE-2026-54402
Critical 9.9
In plain English
A critical-severity improper input validation in Cloud Gateways from Ubiquiti Inc. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.8% (higher than 78% of all known vulnerabilities).
Severity (CVSS 3.1)9.9Critical
Exploit odds (30 days)1.8%top 21.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Ubiquiti Inc | UniFi OS Server | 0 – before 5.1.19 |
| Ubiquiti Inc | Dream Machines | 0 – before 5.1.19 |
| Ubiquiti Inc | Enterprise Fortress Gateway | 0 – before 5.1.19 |
| Ubiquiti Inc | Dream Wall | 0 – before 5.1.19 |
| Ubiquiti Inc | Dream Routers | 0 – before 5.1.19 |
| Ubiquiti Inc | Express 7 | 0 – before 5.1.19 |
| Ubiquiti Inc | Cloud Keys | 0 – before 5.1.19 |
| Ubiquiti Inc | Network Video Recorders | 0 – before 5.1.19 |
| Ubiquiti Inc | Enterprise Video Recorders | 0 – before 5.1.19 |
| Ubiquiti Inc | Cloud Gateways | 0 – before 5.1.19 |
| Ubiquiti Inc | Network Attached Storage | 0 – before 5.1.19 |
| Ubiquiti Inc | Enterprise Firewall Core | 0 – before 5.1.19 |
Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H