# CVE-2026-54403: Ubiquiti UniFi OS authentication bypass via path traversal

Source: https://junglewise.ai/threats/cve-2026-54403-ubiquiti-unifi-os-authentication-bypass-via-path-traversal  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-02. Updated: 2026-07-02  
License: CC BY 4.0 with a link back

CVE-2026-54403 · Severity: high · CVSS 8.6 · Published 2026-07-02

A security vulnerability has been identified in Ubiquiti UniFi OS, the software that manages various networking and security devices like routers, video recorders, and storage systems. An attacker with network access can bypass the login process to gain unauthorized access to the device management interface. This could allow an unauthorized user to view sensitive configuration data or monitor network activity, potentially compromising the security of the entire managed environment.

Technologies: [Ubiquiti Cloud Gateway](https://junglewise.ai/threats/technologies/cloud-gateway), [Ubiquiti Cloud Key](https://junglewise.ai/threats/technologies/cloud-key), [Ubiquiti Dream Machine](https://junglewise.ai/threats/technologies/dream-machine), [Ubiquiti Dream Router](https://junglewise.ai/threats/technologies/dream-router), [Ubiquiti Dream Wall](https://junglewise.ai/threats/technologies/dream-wall), [Ubiquiti Enterprise Firewall Core](https://junglewise.ai/threats/technologies/enterprise-firewall-core), [Ubiquiti Enterprise Video Recorder](https://junglewise.ai/threats/technologies/enterprise-video-recorder), [Ubiquiti Network Video Recorder](https://junglewise.ai/threats/technologies/network-video-recorder), [Ubiquiti UniFi OS](https://junglewise.ai/threats/technologies/unifi-os). Vendors: [Ubiquiti](https://junglewise.ai/threats/vendors/ubiquiti).

## Quick answers

**Is CVE-2026-54403 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-54403 being exploited in the wild.

**How severe is CVE-2026-54403?** High severity, with a CVSS score of 8.6, published 2 July 2026.

**Which products and versions are affected?** Ubiquiti Cloud Gateway < 5.1.19; Ubiquiti Cloud Key < 5.1.19; Ubiquiti Dream Machine < 5.1.19; Ubiquiti Dream Router < 5.1.19; and 5 more.

**Is there a fix for CVE-2026-54403?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-54403 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-54403?** Check whether you run Ubiquiti Cloud Gateway, Ubiquiti Cloud Key, Ubiquiti Dream Machine or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A path traversal vulnerability (CWE-22) exists in Ubiquiti UniFi OS versions prior to 5.1.19. The flaw allows a remote, unauthenticated attacker with network access to bypass authentication mechanisms by manipulating file paths in requests. Successful exploitation grants the attacker unauthorized access to the UniFi OS management interface or specific instances. The vulnerability affects a wide range of hardware including Dream Machines, Cloud Keys, and Network Video Recorders. Users are advised to update to UniFi OS version 5.1.19 or later to remediate the issue.

## Affected products

- Ubiquiti Inc UniFi OS Server < 5.1.19
- Ubiquiti Inc Dream Machines < 5.1.19
- Ubiquiti Inc Enterprise Fortress Gateway < 5.1.19
- Ubiquiti Inc Dream Wall < 5.1.19
- Ubiquiti Inc Dream Routers < 5.1.19
- Ubiquiti Inc Express 7 < 5.1.19
- Ubiquiti Inc Cloud Keys < 5.1.19
- Ubiquiti Inc Network Video Recorders < 5.1.19
- Ubiquiti Inc Enterprise Video Recorders < 5.1.19
- Ubiquiti Inc Cloud Gateways < 5.1.19
- Ubiquiti Inc Network Attached Storage < 5.1.19
- Ubiquiti Inc Enterprise Firewall Core < 5.1.19

## Timeline

- 2026-07-02: disclosed
- 2026-07-02: advisory

## References

- [https://community.ui.com/releases/Security-Advisory-Bulletin-066-066/984eceb3-49c8-4227-942d-671c289b3afc](https://community.ui.com/releases/Security-Advisory-Bulletin-066-066/984eceb3-49c8-4227-942d-671c289b3afc)

## Related threats

- [Ubiquiti UniFi OS CRLF injection authentication bypass](https://junglewise.ai/threats/cve-2026-77550-ubiquiti-unifi-os-crlf-injection-authentication-bypass)
- [Ubiquiti UniFi OS CRLF injection authentication bypass](https://junglewise.ai/threats/cve-2026-77549-ubiquiti-unifi-os-crlf-injection-authentication-bypass)
- [Ubiquiti UniFi OS active debug code privilege escalation](https://junglewise.ai/threats/cve-2026-77545-ubiquiti-unifi-os-active-debug-code-privilege-escalation)
- [Ubiquiti UniFi OS command injection vulnerability](https://junglewise.ai/threats/cve-2026-77540-ubiquiti-unifi-os-command-injection-vulnerability)
- [Ubiquiti UniFi OS command injection in input validation](https://junglewise.ai/threats/cve-2026-77539-ubiquiti-unifi-os-command-injection-in-input-validation)