Is CVE-2026-54400 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-54400 being exploited in the wild.

How severe is CVE-2026-54400?

Critical severity, with a CVSS score of 9.1, published 2 July 2026.

Which products and versions are affected?

Ubiquiti Inc UniFi Access Application < 4.2.29.

Is there a fix for CVE-2026-54400?

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-2026-54400 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-54400?

Check whether anything you run is named in the advisory. 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.

CVE-2026-54400: Ubiquiti UniFi Access Application privilege escalation on host device

Q: Is there a fix for CVE-2026-54400?

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.

Q: How is CVE-2026-54400 attacked?

It is attacked over the network, in a network appliance.

Q: Am I affected by CVE-2026-54400?

Check whether anything you run is named in the advisory. 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.

CVE-2026-54400 · Severity: critical · CVSS 9.1 · Published 2026-07-02

Ubiquiti UniFi Access is a door security and building management system. A security flaw in the management application allows an attacker who already has high-level administrative access to the network to further escalate their permissions to the underlying host device. This could lead to full control over the security hardware and the data it manages.

Quick answers

Is CVE-2026-54400 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-54400 being exploited in the wild.
How severe is CVE-2026-54400?: Critical severity, with a CVSS score of 9.1, published 2 July 2026.
Which products and versions are affected?: Ubiquiti Inc UniFi Access Application < 4.2.29.
Is there a fix for CVE-2026-54400?: 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-2026-54400 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-54400?: Check whether anything you run is named in the advisory. 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

An improper access control vulnerability (CWE-284) exists in the Ubiquiti UniFi Access Application prior to version 4.2.29. The flaw allows a network-based attacker with high-level administrative privileges to bypass intended restrictions and escalate their authority to the host operating system level. The vulnerability is characterized by a CVSS 3.1 score of 9.1, notably involving a scope change (S:C), indicating the impact extends beyond the application itself to the underlying infrastructure. Users are advised to update to UniFi Access Application version 4.2.29 or later to mitigate this risk.

Affected products

Ubiquiti Inc UniFi Access Application < 4.2.29

Timeline

2026-07-02: advisory: Security Advisory Bulletin 066 published by Ubiquiti
2026-07-02: disclosed: CVE-2026-54400 published to NVD via HackerOne

References

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

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