# CVE-2026-54403: Path traversal in Cloud Gateways

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

- **Severity:** High 8.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 Jul 2026
- **Updated:** 2 Jul 2026
- **Also known as:** GHSA-x73q-38h3-xg4c

## 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 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-54403?

It affects 32 products.


Products: 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, Ui Unas Pro 4 Firmware, Ui Unas Pro 8 Firmware, Ui Unas Pro Firmware, Ui Unifi Cloud Gateway Fiber Firmware, Ui Unifi Cloud Gateway Industrial Firmware, Ui Unifi Cloud Gateway Max Firmware, Ui Unifi Cloud Gateway Ultra Firmware, Ui Unifi Cloud Key Plus Firmware, Ui Unifi Cloudkey Enterprise Firmware, Ui Unifi Cloudkey Firmware, Ui Unifi Dream Machine Beast Firmware, Ui Unifi Dream Machine Firmware, Ui Unifi Dream Machine Pro Firmware, Ui Unifi Dream Machine Pro Max Firmware and 12 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.

## Is CVE-2026-54403 being exploited?

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

## Other vulnerabilities in Ubiquiti Inc Cloud Gateways

- [CVE-2026-54402](https://insights.sbomify.com/CVE-2026-54402/): Command injection in Cloud Gateways (critical 9.9)
- [CVE-2026-54404](https://insights.sbomify.com/CVE-2026-54404/): SQL injection in Cloud Gateways (high 8.8)
- [CVE-2026-54401](https://insights.sbomify.com/CVE-2026-54401/): Server-side request forgery in Cloud Gateways (high 7.7)
- [CVE-2026-55110](https://insights.sbomify.com/CVE-2026-55110/): Cross-site request forgery in Cloud Gateways (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-54403 and fix it if it is affected.

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

Affected product: Ubiquiti Inc Cloud Gateways. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-54403/ (Markdown: https://insights.sbomify.com/CVE-2026-54403/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-54403
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-54403
- OSV: https://osv.dev/vulnerability/CVE-2026-54403

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-54403/
Summaries are generated and may contain mistakes; the official description above is the record.