CVE-2026-54403 Path traversal in Cloud Gateways

High 8.6 Published 2 Jul 2026 Updated 2 Jul 2026

A network-based attacker can exploit a path traversal flaw in UniFi OS devices to bypass authentication mechanisms.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-54403?

CVE-2026-54403 is a high-severity path traversal vulnerability in Ubiquiti Inc Cloud Gateways, published on 2 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-22

Which versions are affected by CVE-2026-54403?

It affects 32 products.

Products include Ui Enterprise Firewall Core Firmware, Ui Enterprise Fortress Gateway Firmware, Ui Enterprise Network Video Recorder Core Firmware, Ui Enterprise Network Video Recorder Firmware, Ui Unas 2 Firmware, Ui Unas 4 Firmware and 26 more.

How do I fix CVE-2026-54403?

No fix has been published for CVE-2026-54403 yet. Limit exposure of the affected software until one is available.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2026-54403 being exploited?

There is no known exploitation of CVE-2026-54403 in the wild and no public exploit code.

Sources

Also known as GHSA-x73q-38h3-xg4c.