What is CVE-2026-54400?

CVE-2026-54400 is a critical-severity vulnerability in Ubiquiti Inc Unifi Access Application, classified under Improper Access Control. CVSS score: 9.1/10. Published 2026-07-02.

How severe is CVE-2026-54400?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Ubiquiti Inc Unifi Access Application

CVE-2026-54400

A malicious actor with access to the network and high privileges could exploit an Improper Access Control vulnerability found in UniFi Access Application to escalate privileges on the host device.

EPSS: 0.005 (41.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

Affected products

Ubiquiti Inc Unifi Access Application — versions 0
Ui Unifi_access_application

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

support@hackerone.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-54400?: CVE-2026-54400 is a critical-severity vulnerability in Ubiquiti Inc Unifi Access Application, classified under Improper Access Control. CVSS score: 9.1/10. Published 2026-07-02.
How severe is CVE-2026-54400?: Critical severity. CVSS v3 base score is 9.1 out of 10.